Sect. III. Agriculture and Vegetation. 65 



SOME of it was calcined for four hours in 

 a flrong kitchen fire. The bluifh remained 

 of the fame colour 5 but the red turned 

 lighter in its colour. The firft contained 

 a few particles, which were attracted by 

 the magnet j the laft almoft none. It fell 

 as foon as the unburnt in water, and with 

 the fame appearances. 



I dim' lied four ounces of it in a flrong 

 heat for eight hours, and it gave me only 

 one ounce of pure water. 



IT did not detonate with nitre in fuiion, 

 but fome few fparks appeared, which mews 

 that it contains oil. 



THIS oil I extracted, by boiling four 

 ounces of it with two ounces of potames 

 for many hours ; to this decoction I added 

 fpirit of nitre, and got a precipitation of a 

 red heavy oil, which detonated with nitre 

 in fufion. 



F I took 



