OF FOSSILS. 



cxv. Neutral Salts. 



SALTS formed by the cxatl faturation of acids 

 wkh alkalies amount to iixty double fpccics, on 

 the fuppofition that the acids do not exceed 

 twenty in number. A confulcrablc part, how- 

 ever, of the combinations of thcfc are as yet un- 

 known, or at lead but impcrfedly examined. 



ex vi. Lnperfccl double Salts. 



MANY imperfect double falts have been dif- 

 covered. The acids of vitriol, arfenic, tartar, 

 and for re 1 unite in cxcefs with the vegetable al- 

 kali ; and the acids of vitriol and tartar with the 

 mineral alkali. The labours of poilcrity will 

 probably add a greater number. Borax retains 

 an excefs of alkali ; and the arfenicatcd miner- 

 al alkali like wife r capable of a Ilmilar combin- 

 ation. 



ex vi i. Triple Salts. 



THE fult of Seigncttc, and tartar faturatcd 

 with volatile alkali, furnifli examples of the neu- 

 tral triple faits. 



K4 Jcxvnr. 



