tz ESSAYS* AND OBSERVATIONS 



E X P E R. XT. 



Adraclimofa friable flate-marle af- 

 forded a reftduum of iS grains of yellow 

 fand. 



E X P E R. XII. 



A draclim of limeilone coatained la 

 grains of unfoluble matter, which was- 

 altogether fand. 



EXPER. XIII. 



A drachm of another limeftone gave 

 only fix grains of refidue, which appear- 

 ed tv^ be a flime. 



.EXPER. XIV. 



A drachm of fliell marie, dug out at tjie 

 depih ut two feet from the furface, contain- 

 ed 



der another denomination ; but they are generally ac-< 

 counted tnarlei, and employed as fuch indifcriminatdy 

 with the raarleyy?rfl/« contiguous to them. 



