PHYSICAL AND LITERARY. 41 



SECT. VIII. 



ALL the foregoing Experiments were 

 directed towards the refolution of marie. 

 I next attempted an artificial compofition 

 of this fubftance. 



EXPER. XXIV. 



Seven parts of pure chalk were mix- 

 ed, and, by the aihftance of water, well 

 kneaded with one part of tough clay. 

 This pafte, when dry, relented fuddenly 

 upon the application of water. Water 

 alfo readily reduced it to powder, after 

 a fufficient calcination. From this, and 

 Experiments 9. and 20. it appears, that 

 all proportions of clay and calcarious 

 earth compounded togethef, will not re- 

 fift the influence of water applied to them 

 after calcination. 



Vol. in. F EXPER. 



