348 On the Analyjis and Synthejis 



4tb, This infoluble powder has no favour; it is infoluble 

 in cold water, but it is ibluble in boiling water in notable 

 proportions. 



5th, Though this matter be little foluble in water, lime- 

 water however produces in the liquor a very fenfible precipi- 

 tate. Nitrate ot lilver furniihes one alio, which is loluble in 

 nitric, acid. 



6th, Ammonia occafions no change in the folution of the 

 matter in queltion. As little etlctl is produced by the lixed 

 alkalies. 



7lh, The oxalate of ammonia made no alteration in the 

 above liquor, which it would certainly have done, had there 

 been a fuitable quantity of lime. 



8th, This fait is exceedingly fufible. By the blow-pipe it 

 fufes into a pearl, tranfparent while in a ftate of fufion, but 

 which on cooling becomes opake. 



9th, Thij powder is foluble in the nitric, muriatic, and 

 even phofphoric acids. Thefe folntions are thick, vifcous, 

 and tenacious, like clear ftarch. When thefe folutions are 

 fufficiently diluted with water, they give no precipitates by 

 alkalies; but, if concentrated, they give one, which rediflblves 

 in a large quantity of water. 



From all thefe experiments we are authorized to conclude 

 the citizens Guyton and Deformes took an alkaline phofphate 

 for phofphate of lime. This phofphate, which is fcarcely fo- 

 luble, as above feen, is not a limple phofphate ; for it is 

 known that the alkaline phofphates are very foluble, efpecially 

 that of potaHi ; but it was not before known that in the ex- 

 periment of which we have given an account there is formed 

 a new phofphate, which ought to be diftinguiflied by the 

 name of neutral phofphate. I'he following experiment ferves 

 alfo to conUrm this reafoning, and confirms in an irrevoca- 

 ble manner all thofe delcribed. 



I mixed a certain quantity of phofphate of potafli with 

 pure potafli, placed the mixture in a platina crucible, and 

 expofed it to a ftrong heat. I obtained for refult a white fub- 

 ftance, almoft infoluble, which poirefled all the properties of 

 the fiilt obtained in the laft experiment, and which was again 

 ■afcertained to be a real phofphate of potafh with an excels of 

 bafe. This kind of fynthefis itill proves that the phofphate 

 of lime defcribed by the above authors is only this new fait, 

 which, on account of its apparent properties and infolubility, 

 lias been too little examined. 



Exp. VI. By treating hyper-oxygenatcd muriate of foda 

 in the fame manner as that of pptalli, thefe authors announce 



that 



