304 LUTES. 



taken off by copying machines on unsized silver 

 paper. 



With this composition, made with a small quan- 

 tity of water, that it may have a consistence simi- 

 lar to plastic clay, models, busts, statues, basso 

 relievos, and the like, may be formed. When dry, 

 the articles made of it are susceptible of a high 

 polish ; they are also very durable. 



The Japanese make quadrille fish of this sub- 

 stance, which so nearly resemble those made of 

 mother of pearl, that the officers of our East India- 

 men are often imposed upon. 



Of Sizes. 



Common size is manufactured in the same man- 

 ner, and generally by the same people, as glue. 

 It is indeed glue left in a moister state, by discon- 

 tinuing the evaporation before it is brought to 

 a dry consistence, and, therefore, further par- 

 ticulars respecting the manufacture of it are 

 needless here. 



Isinglass size may also be prepared in the man- 

 ner above directed for the glue, by increasing the 

 proportion of the water for dissolving it. And the 

 same holds good of parchment size. 



I.UTES. 



In many chemical operations the vessels must 

 be covered with something to preserve them from 

 the violence of the fire, from being broken or 

 melted, and also to close exactly their joinings 

 to each other, in order to retain the substances 

 which they contain, when they are volatile and 

 reduced to vapour. 



