i68 Of the Sulphur, £?<:. 



Nay, how can the half, or a fourth only ; feeing 

 oils per fe contain not a little earth, and more than 

 a little oil was employed in this procefs •, on the 

 contrary, xht fulphur confifts leail of all in an earth, 

 but almofl entirely in the acid fait ? 



(5.) Are all greens the effect of a copper ? Does 

 not alcali with acid, alfo with fulphur, make a 

 green ? Though I allow fulphur a copper-earth, 

 which is only to be fhewn with fal- ammoniac, or 

 fpirit of urine. 



(6.) Has he fufficiently reflected, when he 

 exprefTes his furprize at the quantity of the water 

 gone over, and which he might alfo have eafily 

 fuppofed in oils, that in the explicit enumeration 

 he above makes of the principles of the fulphur, 

 he has there left it quite out, and would here 

 reckon it for one ? For the reft, this experiment 

 is fo far ingenious, that not only a large quantity 

 of acid fait is educed, but an extraordinary pro- 

 portion to its quantity in the fulphur ; and it is no 

 fmall commendation to M. Homberg, that he has 

 fhewn fo much diligence in the examination of na- 

 tural bodies, and difcovered fuch a number of 

 truths, that we fcarce find many to have equalled 

 him in this refpect. 



CHAP. 



