[ i36 ] 



found on the filtre being weighed (fubftrading the weight of the 

 filtrc) gives the quantity of filiccous matter ; and this weight 

 fubftraded from that of the dried mafs gives that of the argill ; in 

 this cafe I will fuppofe the filiceous mafs to weigh 140 grains, then 

 the argillaceous fhould weigh 95 grains. 



Then the compofition of one pound of the foil is as follows : 



Stony matter 

 Water 



Fibres of roots 

 Soluble coal 

 Saline matter 

 Silex 

 Argill 

 Mild calx 



1017,66 

 100 

 - 10 

 12 



4 



140 X 12= 1680 



95 X 12= 1140 



150 X 12= 1800 



5763,66 



And in ccntcfimal proportion « 



Stony matter 

 Fine filiceous 



Argill 

 Mild calx 



18 

 29 



47 

 22 



31 



lOO 



Its 



t An error of 3,66 grains for decimals omitted in fubftraftions. 



