$gi Mr^HenrfsCon/tde'rations on different Materials, 



fimilar opinion. We have feen in the abftradt I 

 have given, of M. Betholet's analyfis of aninnal 

 &nd vegetable fubftances, that wool and filk 

 yield much acid of fugar, together with a fatty 

 oil, whereas cotton gives no faccharine acid, 

 no oil, and, in fhort, that the whole fubftance 

 is capable of being diflipated in the form of 

 gas, leaving no refiduum in the retort, and 

 communicating nothing permanent to the ni- 

 trous acid which diftils into the receiver. 



I wi(h that fome perfon, whofe opportunities 

 and leifure are greater than mine, would 

 compare, by fuch an analyfis, cotton, in its 

 natural (late, and cotton prepared in the feven 

 leading operations for the'Turkey red; in order 

 to determine whether it have, by this treatment, 

 acquired properties more nearly approaching 

 to animal matter ; viz. whether in the latter 

 ilate it will afford more acid of fugar, and 

 give over on diftillation, an oily matter, re- 

 fembling that obtained from animal fubftances. 



Another point which it might be important 

 to afcertain is, what increafe of weight the 

 cotton acquires after each fteeping. It appears 

 from the account of the Gentlemen appointed 

 to fuperintend and repeat Mr. Borelle's pro- 

 cefs, that, previous to the maddering, or 

 imparting of the colouring matter, the cotton 

 had increafed to the amount of 4 of its ori- 

 ginal w-ight, though it had been well waflied 



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