64 Vfe Principles of Part II. 



quantity. As none has yet analyzed it, we 

 fhall undertake that tafk. 



Exp. 27. It is fometimes of a bluifh, 

 fometimes of a reddifh colour ; and when 

 moifr., feels exactly like hard foap betwixt 

 the fingers. 



IT falls like marl when put in water: 

 if it is well mixed with the water, it fepa- 

 rates into different parts from their diffe- 

 rent fpecific gravity j at the bottom there 

 is a layer of large grey particles -, above 

 that are fome darker ; next thofe of a dark 

 brown colour ; and the uppermoft is a light 

 white powder ; a great deal of which was 

 fufpended in the water for 20 hours. 



IT effervefces with none of the acids. 

 In this it differs from marl. 



Exp. 28. Some of it was lixiviated in 

 water 5 which being evaporated, gave a 

 very little fea fait. 



Exp. 



