EXTRACTS FROM EXHIBITION LECTURES. 



the cmfettionei . \eiy thm wliilt. 

 a quantity of objects of luxiirj 



ami tulll^|lal■ellt sIklI^ 

 ornaraont foi'iiie 1 d 



Extracts from Exhibition Lectures, 

 delivered before the Society of 

 Arts. 



Professor Osven g'i\-es the following 

 account of a comparatively new branch 

 <jf art, which promises to prove of 

 great importance : 



Oelatines. — Such productions as 

 coral, shell, and peai'l, are naturally 

 attractive by their intrinsic beauty or 

 larity. But the most refuse and un- 

 nn iting, and seemingly most worthless 

 >arts of animal bodies, are turned to 

 uses of the most unexpected kind by 

 the inventive skill and science of man. 



The raw materials chiefly used in 

 manufactures derived from the gela- 

 tinous textures of animal bodies, may 

 ,' divided, as regards their commer- 

 al value and application, into two 

 uds: 



1st. The gelatines and glues, pro- 



i-ly so called, derived from the dis- 



ilution of certain animal tissues, and 



-pecially fi-om the waste residue of 



irts of animals which haxe served 



tor food, or for the operations of tan- 



_:;^ / X nmg, or for the fabiication, as from 



^;i;(/^ bones, of articles in imitation of ivory, 



'^X^ 01 from the waste particles in the carv- 



^ mg of ivoj-y itself. 



. '-jj 2nd. The cleaned and dried niem- 



\ branes of different species of fish, 



\ more especially of the sturgeon family, 



/,; (Acipenseridce,) preserving a peculiar 



_™, texture, on which their value in the 



_ ."^1 lefining of fermenting liquore more 



""^ especially depends ; such membranes 



' '' are called " isinglass." 



The most remarkable progi-ess iu 

 I the economical extraction and prepa- 

 1 ition of pure gelatines and glues from 

 the waste remnants of the skins, bones, 

 " ti-udons, ligaments, and other gelatin- 

 ous tissues of animals, has been made 

 in France, where the well-organized 

 aid admirably arranged establish- 

 1 iients for the slaughter of cattle, sheep, 

 md horees in large towns, give great 

 md valuable facilities for the econom- 

 ic al applications of all the waste pai-ts 

 < )f animal bodies. Among the beau- 

 titul productions of this industry, the 

 \ ecimens exhibited b}' its chief origi- 

 ■ a xtoi, M. L. F. Grenet, under No. 247, 

 mented pecuhar approbation. They 

 < mcluded different kinds of gelatine iu 

 thm 1 \) ers, adapted for the dressing of 

 stuffs, and for gelatinous baths, in tho 

 clanfi(.ition of wines which contain a 

 sufBcicnt cpiantity of tannin to preci- 

 \ itite the gelatine ; pure and white 

 'fll i/ II \*Si H^ t, htines cut into threads forthe use of 

 U(.u' 01 ice pipei, toi LOjiyiiig drawings; and, finally, 

 gilt aelat nes a 1 ipted to a variety of purposes, and 



