GUANO.

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Seneral gutter of discharges into the cistern b ; o, a block and tackle for hoisting theCa geful of bones in and out. Fig. 72 is an end view of the apparatus ; a, the main

steam-pipe; a, b, c, c, branches that conduct thesteam to the bottom of the cylinder; o, thetackle for raising the cage; s, stopcock; n, smallgutter; m, main conduit; b, cistern of reception.

When a strong and pure jelly is wished for,the cylinder charged with the bones is to bewrapped in blanket stuff; and whenever thegrease ceases to drop, the stopcock which admitsthe cold water is to be shut, hs also that at thebottom of the cylinder, which is to be opened onlyat the end of every hour, and so little as to letthe gelatinous solution run out, without allowingany of the steam to escape with it.

Butcher’s meat contains on an average in 100pounds, 24 of dry flesh, 56 of water, and 20 of

bones. These 20 pounds can furnish. 6 pounds

of alimentary substance in a dry state; whenceit appears that, by the above means, one fourthmore nutritious matter can be obtained than isusually got. I am aware 'that a keen disputehas been carried on for some time in Paris , be-tween the partisans and adversaries of gelatineas an article of food. It is probable that bothparties have pushed their arguments too far.» Calf’s-foot jelly is still deemed a nutritious

t rt lcle by the medical men of this country, at least, though it is not to be trusted

0 alone, but should have a due admixture or interchange of fibrine, albumine.

Rs eum, &c.

GILDING. See E-Lecte.o-Metaii.urgv.

..-Glass. Duty collected on it in the United kingdom : In 1831,732,4551.; 1832,,,“M48Z.; 1833, 828,5581.; 1834, 916,8221.; 1835, 966,1211.; 1836, 933,2811.; 1837,' U ?.846Z.; 1838, 879,8591.; 1839, 868,1931.; 1840, 965,9671.

Grystal glass is rapidly corroded by the sulphate of ammonia, at a heat of 600° F.GLOVE. See Leather.

GLUCOSE, the name given to grape and starch sugar by M. Dumas.jtjGROWAN. The name given by the Cornish miners to 'granite, and to rocks of like

0 GUANO. This extraordinary excrementitious deposite of certain sea-fowls, which/'Urs in immense quantities upon some parts of the coasts of Peru, Bolivia , anditit a ’ ^ as I ate N become an object of great commercial enterprise, and of intense,-Grest to our agricultural world. Four or five years ago it was exhibited and talkedQterely as a natural curiosity. No one could then have imagined, that in a shorts ^“ r *°d it would be imported from the coasts of the Pacific in such abundance, and ats a moderate price, as to cheer by its fertilizing powers the languid and depressed« r «s of the farmers throughout the United Kingdom . Such, however, is now theas a G es l e( I % the concurring reports of almost all the agricultural societiesn- Great Britain and Ireland. No less than 28,500 tons of guano have been already3 §Ij° r ted from Peru and Bolivia , 1,500 from Chili, and 8,000 from Africa, altogether*>l th tons, while more is on the way. The store of it, laid up from time immemorialc on allove localities, seems to be quite inexhaustible ; especially since it is receivingv|tant accessions from myriads of cormorants, cranes, &c.av ing been much occupied with the chemical analyses of guano during the lastco-° ^ ears I° r Messrs. Gibbs, of London , and Messrs. Myers, of Liverpool, who are thethjpr ents G le Peruvian and Bolivian governments, I have enjoyed favorable oppor-a hal. °*" exam i n i n p samples of every description, and hope to show that many of the

h>al ' Ses °1 guano hitherto published have been made upon specimens not in their nor-St t° r soun( l state, like the best imported by the above houses from Chincha and Bolivia ,’•h a certain state of eremacausis and decay.

N aaa o, in the language of Peru , signifies dung; a word spelt by the Spaniards guano.§iv 0 nat ' ves have employed it as a manure from the remotest ages, and -have by its meansw tts n fei ’tility to the otherwise unproductive sandy soils along their coasts. While Peru ’The ° Veinecl its native incas, the birds Were protected from violence by severe laws.o Us . pun ishment of death was decreed to persons who dared to land on the guanifer-t| ic I n Slanda during the breeding period of the birds, and to all persons who destroyedn at any time. Overseers were appointed by the government to take care of the

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