326 Tha'nome7io afforded ly Animal Mqtfet'f 



one which was bl>>ckish brown ; nitrate of linie had net 

 a,nv effect, but acctite ot" lead oGca^i^1ned a verv copious 

 precipitate of a pale brown colour. This substance, there- 

 tore, appeared to be a portion of the taming matter so mo- 

 dified as partly to pos:-e*3 the characters of extract *. 



Other experiments were made on the tanriing substance 

 prepared from various bodies, which by the dry and by the 

 humid v\av had been previously reduced to the state of coal: 

 but these I shall here omit, and shall pass to the descrip- 

 tion of a series of experiments, by which I obtained a va- 

 riety of the artificial tanning substance in a way difi'erent 

 from that whiih has been related, and with which 1 was 

 unacquainted when mv former paper was written. 



[To be ccntinued.] 



LXII. Extract from a Memoir It/ Xlcssrs. Fourchov and 

 VAuauELiN i/pon the PJuenomenn and the Products whick 

 jlimnal Matters afford, when treated with Nitric Acid, 

 Bead at the National Institute-^. 



JL HE discovery of azote in animal substances, by the la- 

 bours of M. Berthollet, and the disengagement of this prin- 

 ciple during the application of the nitric acid to these sub- 

 stances, is one of the most beautiful improvements in mo- 

 dern chemistry. 



Messrs. Fourcrov and Vauquelin, by repeating these ex- 

 periments on muscular flesh, have added to this valuable 

 fact others of a very interesting nature. 



We shall proceed to give a concise account of their ex- 

 periments, and of the results which they have yielded. 



I. A mixture of 150 grannnes of nniscular flesh, with 

 an equal quantity of nitric acid of 32 degrees strength, and 

 of water, when introduced into a matrass and heated to 

 gentle ebullition, cave out ()(i inches of gas, which was 

 found to consist of nine-tenths azote and one-tenth car- 

 bonic acid. 



The residuum consisted of the remains of the flesh, still 

 retaining, in part, its fibrous appearance ; of a yelIo\y liquor ^ 

 and of a layer of vtljnw fatty matter on the surface of the 

 liquor. Having separated this matter and filtered the li- 



• When added t j a soliuion of carbonate of ammonia it produced some 

 efTervesccncc, but its peculiar vegetable odour d.d not sjffe;" any dimiuu- 

 tion. 



•}■ from the An/ia'fi Jc ChimU; No. 16C. 



quid. 



