The Mirror of Literature, Amusement, and Instruction. Volume 20, No. 565, September 8, 1832

LINES

Written after reading the Memoir and Poems of Miss Lucretia Davidson. ²

 
Ev'n till thy latest hour, Lucretia! thou
Didst cherish that which but consum'd thy frame.
'Twas then it shone the brightest on thy brow,
Like the last flickerings of an earthly flame—
Yes, thy brain harass'd by deep toil, became
With all its fire, a tenant of the tomb,
And dim is now thine eye, Belov'd of Fame!
Thy cheek is pale—thy lip without perfume—
And there thou liest—the child of Genius—and its doom.
 
 
Like the proud eagle soaring to the skies,
Intent "the topmost arch" of heaven to scale,
When heeding naught that would oppose its rise,
It breaks with fearless nerve the tempest-gale—
And spreads its wings like a majestic sail,
Full on the bosom of the raging blast,
Thy spirit soar'd—but ah! too like us frail,
When the same breeze which bore it from the dust
Wing'd home the fatal shaft that tore its bleeding breast.
 
 
Would I could sing thy fame with thine own lyre,
Then should I breathe a more deserving lay,
A lay which every spirit would inspire,
And melt each eye to tears of sympathy;
But others at thy shrine, their tributes pay.
Offspring of Beauty! child of native song!
And I, ev'n I, would venture to essay,
To raise my lauding voice amidst the throng
Of those who weep thy loss—and who shall weep it long!
 

N.C.

Spirit of Discovery

IMPROVED RAW SUGAR

[We find the following information communicated to the Literary Gazette, apparently by the parties connected with the improvement.]

Considerable interest has been excited in the market by the introduction of an improved native raw sugar, which portends very great advantages to all who are engaged in this so long unprofitable branch of colonial and commercial intercourse. It is pure raw sugar, obtained direct from the cane-juice, without any secondary process of decoloration or solution, and by which all necessity for any subsequent process of refining is entirely obviated. It is obtained in perfectly pure, transparent, granular crystals, being entirely free from any portion of uncrystallisable sugar or colouring matter, and is prepared by the improved process of effecting the last stages of concentration in vacuum, and at a temperature insufficient to produce any changes in its chemical composition; the mode of operation first proposed by the late Hon. Ed. Charles Howard, and subsequently introduced, with the most important advantages and complete success, into the principal sugar-refineries of Great Britain.

By this improved and scientific process of manufacture, the application of which to the purpose of preparing raw sugar from the cane-juice has now first been proposed, the most singular advantages are secured to the planter, in an increased quantity of sugar, the product of his operation, and in saving from the immense quantity of deteriorated material, uncrystallisable sugar and molasses, which were products of the former mode of operation, from the intense and long-continued degree of heat employed in the processes. The time and labour of the operation are also greatly decreased; the apparatus possesses the power to make double the quantity in the same space of time as the old method, and this is ready for shipment in four days, in lieu of three weaks, as heretofore. The sugar likewise readily commands an advanced price in the market to the planter of ten or twelve shillings per cwt.

This improved sugar readily ensures a preference for all purposes of manufacture, solution, or domestic economy. It is a purer sweet, and of a richer mellifluous taste than even the best refined; it is not apt to become ascescent in solution; and, from its superior quality, it well answers all purposes of the table. In the manufacture of rum from the molasses, which are separated during the first process of the operation, there is no danger of deterioration in the production of empyreuma, and a far purer spirit is obtained than that made from ordinary molasses.

This improved process is now in complete and successful operation on eight estates in Demerara. The general introduction of the process is considered by the best practical judges to ensure certain means of revivifying the spoiled fortunes of the planters, and to open a new era in the prosperity of those portions of the British crown, of which this forms the principal staple commodity of support.

[According to Dr. Moseley, the art of refining sugar, and what is called loaf sugar, is a modern European invention, the discovery of a Venetian, about the end of the fifteenth or beginning of the sixteenth century. Sugar candy is of much earlier date, for in Marin's Storia del Commercio de Veneziani, there is an account of a shipment made at Venice for England in 1319, of 100,000 lbs. of sugar, and 10,000 lbs. of sugar candy. Refined, or loaf sugar is mentioned in a roll of provisions in the reign of Henry VIII.

The process of refining sugar in vacuo is the most useful application of "the fact that liquids are driven off, or made to boil at lower degrees of heat when the atmospheric pressure is lessened or removed."³ The first part of the process is to dissolve impure sugar in water, and after clarifying the solution, to boil off or evaporate the water again, that the dry crystallized mass may remain. Formerly this evaporation was performed under the atmospheric pressure, and a heat of 218° or 220° was required to make the syrup boil; by which degree of heat, however, a portion of the sugar was discoloured and spoiled, and the whole produce was deteriorated. The valuable thought occurred to Mr. Howard, that the water might be dissipated by boiling the syrup in a vacuum or place from which air was excluded, and therefore at a low temperature. This was done accordingly; and the saving of sugar and the improvement of quality were such as to make the patent right, which secured the emoluments of the process to him and other parties, worth many thousand pounds a-year. The syrup, during this process, is not more heated than it would be in a vessel merely exposed to a summer sun.

Lord Brougham, in his Introduction to the Library of Useful Knowledge, characterizes this as a process, by which more money has been made in a shorter time, and with less risk and trouble, than was ever perhaps gained from an invention; and as "the fruit of a long course of experiments, in the progress of which known philosophical principles were constantly applied, and one or two new principles ascertained."⁴

The scene of this discovery was, in all probability, the Deepdene, near Dorking, the retreat of the late Mr. Thomas Hope, the author of Anastasius. Here the Hon. Mr. Howard, brother of the Duke of Norfolk, resided at the commencement of the last century, and is stated to have enjoyed that philosophical retirement which may be described as the happy haven of a truly great mind. He planted a portion of the grounds, the greater part of the estate being so admirably disposed by nature as almost to forbid the fashioning of men's hands. At Mr. Howard's death, the estate descended to the Duke of Norfolk, who sold the property, in 1791, to the late Sir William Burrell, whose lady wrote the following lines, which are on a tablet in the grounds:

"This votive Tablet is inscribed to the memory of the Honourable Charles Howard, who built an oratory and laboratory on this spot: he died at the Deepdene, 1714.

 
If worth, if learning, should with fame be crown'd,
If to superior talents, fame be due,
Let Howard's virtues consecrate the ground
Where once the fairest flowers of science grew.
 
 
Within this calm retreat, th' illustrious sage
Was wont his grateful orisons to pay,
Here he perused the legendary page,
Here gave to chemistry the feeling day.
 
 
Cold to ambition, far from courts remov'd,
Though qualified to fill the statesman's part,
He studied nature in the paths he lov'd,
Peace in his thoughts, and virtue in his heart.
 
 
Soft may the breeze sigh through the ivy boughs
That shade this humble record of his worth;
Here may the robin undisturbed repose,
And fragrant flowers adorn the hallow'd earth.–January 1792."
 

The tablet is of plain wood—black letters painted on a white ground. It is an unostentatious memorial, which has been respected amidst the extensive alteration and embellishment of the grounds by the late Mr. Hope. To our minds, neither of the treasures of art which are assembled within the splendid saloons of the adjoining mansion, or sculpture gallery, will outvie the interest of this humble tribute to the memory of departed genius.]

THE LANDERS VOYAGE AND DISCOVERIES ON THE NIGER

The travellers, in embarking on the Atlantic, had solved the greatest problem in African, and even in modern geography;—one which had exercised the ingenuity and conjecture of so many learned inquirers, and in the efforts to solve which so many brave and distinguished adventurers had perished. This discovery divested the Niger of that singular and mysterious character, which had been one chief cause of the interest that it had excited—when seen rolling its ample flood from the sea towards vast unknown regions in the interior. The circuit by which it reaches the Atlantic assimilates its character to that of ordinary rivers, without any much more remarkable windings than are found in others of similar length. It displays, however, a magnitude considerably greater than had been suggested by any former observation.

We can now trace very distinctly, the entire line of this great river. Its source, though not actually visited, seems ascertained by Laing to exist in the high country of Kissi, about 200 miles in the interior from Sierra Leone. Thence it rolls through Foota Jallo and Kankan, where Caillie describes himself to have found it already a rapid and considerable stream. At Bammakoo, having received the tributary from Sankari in Manding, which Park mistook for the main river, it begins its course over the fine plain of Bambarra, where it forms a noble stream; and in passing Sego, the capital, has been considered as equalling the Thames at Westminster. Thence it pursues a north-westerly course, and flowing through the lake Dibbie, reaches Timbuctoo. Its course from that city to Youri has not yet been delineated; but the fact that Park navigated down from one place to the other, fully establishes the continuity. During this reach the Niger makes a great change of direction from north-east to almost due south. From Youri to the sea, it was navigated by the present travellers, and was found following generally a southern direction, though making in one part a rapid bend to the east, whence it gradually returns. If we measure two distances, one from the source to Timbuctoo, and the other from that city to the sea, we shall have nearly 2,000 miles, which may be considered as the direct course; and the various windings must raise the whole line of the stream to upwards of 3,000 miles. For several hundred miles of its lower course, it forms a broad and magnificent expanse, resembling an inland sea. The Niger must after all yield very considerably to the Missouri and Orellana, those stupendous rivers of the new world. But it appears at least as great as any of those which water the old continents. There can rank with it only the Nile, and the Yangtse-kiang, or Great River of China. But the upper course of neither is yet very fully ascertained; and the Nile can compete only in length of course, not in the magnitude of its stream, or the fertility of the regions which it waters. There is one feature in which the Niger may defy competition from any river, either of the old or new world. This is in the grandeur of its Delta. Along the whole coast, from the river of Formosa or Benin to that of Old Calabar, about 300 miles in length, there open into the Atlantic its successive estuaries, which navigators have scarcely been able to number. Taking this coast as the base of the triangle or Delta, and its vertex at Kirree, about 170 miles inland, where the Formosa branch separates, we have a space of upwards of 25,000 square miles, equal to the half of England. Had this Delta, like that of the Nile, been subject only to temporary inundations, leaving behind a layer of fertilizing slime, it would have formed the most fruitful region on earth, and might have been almost the granary of a continent. But, unfortunately, the Niger rolls down its waters in such excessive abundance, as to convert the whole into a huge and dreary swamp, covered with dense forests of mangrove, and other trees of spreading and luxuriant foliage. The equatorial sun, with its fiercest rays, cannot penetrate these dark recesses; it only exhales from them pestilential vapours, which render this coast the theatre of more fatal epidemic diseases than any other, even of Western Africa. That human industry will one day level these forests, drain these swamps, and cover this soil with luxuriant harvests, we may confidently anticipate; but many ages must probably elapse before man, in Africa, can achieve such a victory over nature.

The Niger, besides its own ample stream, has a number of tributaries, equal perhaps in magnitude and importance to those of any other river on the globe; with the exception of the united streams of the Mississippi and Missouri. At no great distance above the point where the Delta commences, the Tshadda, nearly equal in magnitude to itself, enters it; after watering large and fruitful kingdoms, of which the names only, and of these but a very few, have reached us. On this river an extensive commerce and active navigation is said to prevail; the existence of which is further confirmed by the great importance attached to Funda, and other cities situated at or near the junction. It would have been deeply interesting, and have given a new importance to the river communications of Africa, could we have believed, what was positively asserted by very credible witnesses, that vessels by its channel sailed to and from the lake Tchad, and thus held intercourse with the kingdoms of Loggun and Bornou. It seems certain that the names Tshadda, Shary, and Tchad, are one and the same. But the identity of the two first as rivers is what we are precluded from all possibility of believing, by the circumstance that the Shary of Loggun and Bornou, which Major Denham saw and sailed upon, was found by him falling into lake Tchad, while the Tshadda of Lander fell into the Niger; consequently they are distinct streams, flowing in opposite directions. It is very probable indeed that their fountains may be in the same mountain chain, and at no great distance; and even that some of their branches may approach very near, so that merchants may, by an easy portage, convey commodities between them. Nay, it is not quite impossible that they may be united by some connecting channel, as the Amazons and the Oronooka are; but this seems scarcely probable.

At no great distance above the Tshadda, enters the Coodonia, a smaller river, but which Lander had seen flowing through a very fertile and highly cultivated country. Considerably higher is the Cubbie, a large stream from the country and city of that name; and higher still the Quarrama, which has passed by Zirmie and Sackatoo. Between this point and Timbuctoo, we have no means of knowing whether any or what rivers fall into the Niger. The tributary which passes that city is of no great importance; but at the eastern boundary of Bambarra, Park describes the influx from the south of two great streams, the Maniana and Nimma; and it seems very doubtful if Caillie was not mistaken in supposing the latter to be a mere branch of the Niger. The higher tributaries, descending from the mountains, swell the stream, without themselves affording any important navigation.—Edinburgh Review.