98 The Principles of Part III. 



Exp. 31. May 2. 1755, I took fome vir- 

 gin earth from the fide of a fleep bank, 

 where neither dung nor plough had ever 

 been ; filled fome pots with it j mixed with 

 the earth the following materials ; and fet 

 them in the ground. Each pot contained 

 about 61b. of earth. In each pot I plant- 

 ed five grains of the fame barley $ and 

 that I might be fure that each grain was 

 proper for feed, I took none but what fell 

 to the bottom of water. N i. contained 

 plain virgin earth, that I might have a 

 Standard for the reft. N 2. was always 

 watered with hard water. N 3 . had i oz. 

 of faltpetre, and 2 oz. of oil of olives, 

 mixed with the earth. N 4. contained 

 i oz. of faltpetre. N 5. contained half 

 an oz. of vitriolated tartar. N 6. con- 

 tained i oz. of flour of brimftone. N 7. 

 contained half an oz. of fpirit of hartf- 

 horn. N 8. contained 2 oz. of oil of 

 olives. N 9. contained fpirit of nitre, 

 diluted with water, half an oz. N 10. 



con- 



