Sedl. V. Agriculture and Vegetation. 29 



quantity of fand with the fame quantity of 

 fpirit of nitre, in another glafs ; the fame 

 with fpirit of fea-falt, in a third. March 28. 

 the acids appeared turbid. I mixed with 

 each fome water, that I might get the fand 

 eafier away by itfelf, and that the particles 

 mixed with the acids might be more eaiily 

 feparated. The fand in the firft glafs weigh- 

 ed 7 gr. 5 and that in the fecond and third, 

 64: gr- That I might precipitate from the 

 liquors whatever was diffolved by the acids, 

 I mixed with each as much pearl ames as 

 was necelTary to faturate the acids. After 

 the efFervefcence was over, there was a 

 brownifh oozy powder at the bottom of the 

 ol. vitriol, and an oily fubflance at the bot- 

 tom of the other two, which was quite dif- 

 tincl: from the water. What was precipi- 

 tated from the fpirit of nitre, was yellow ; 

 from the fpirit of fait, was white. The for- 

 mer, when feparated from the water, defla- 

 grated with melted nitre, which mowed it 

 to be of an oily nature ; but the latter did 



not. 



