26 ESSAYS AND OBSERVATiaNS 



nity to that of liine-ftone. A gentle gra- ^ 

 dation from the one to the other of thefc 

 fubftances may be eafily traced out;r 

 and k wiU be difficult, I believe, to efta- 

 bllili the precife li r.its of either. Both 

 of the .11 are found in continued Jirata y 

 both of them diilolve in part, with conii-- 

 derable eflervefcence, in acids j and both 

 of them yield by calcination a quick-lime. 

 In the foregoing Experiments^ however, 

 two very remarkable differences occur: 

 By being expofed to the air, marie falls 

 down into duft ; 'lime-llone retains its 

 origirtal {lability. On the contrary, af- 

 ter undergoing the adion of fire, lime- 

 fl'one is reduced to pov/der by the appli- 

 cation of water ; marie fuffers no fuch' 

 change. This diverfity cannot, with 

 juftice, be afcribed to ths different pro-^ 

 portions of Galcarious earth in thefe two' 

 bodies. For the marie of Experiment 7, 

 did not contain kfs of this than the lime- 

 ftone of experiment 12, ; and in the marled 



of 



fture. Such cnly are real marles. Others, as thofe of 

 Szgeriraent 9, 10. 11. decline towards lims-ilocci 



