n8 The Principles of Part III. 



pot; thofe in N 2. a degree taller than 

 thofe in N a I. July 27. the plants in both 

 pots equal. Aug. 13. the plants in N i. 

 are r,ather taller than thofe in N 2. : but 

 none of them thrive well ; either becaufe 

 they were late fown, or becaufe they were 

 in a corner where two tall hedges met, and 

 therefore wanted air. I removed the pots 

 to a more open place. Sept. I. N I. has 

 one taller, and of a deeper green, than N 2. 

 The plants have grown fafter than before. 

 Sept. 30. the plants are come to no per- 

 fection. 



Cor. i. The plants in the two laft expe- 

 riments did not vegetate near fo quickly in 

 the fame time, as thofe of the preceding 

 experiment had done. Has not the ipring, 

 from fome particular caufes which operate 

 at that time, a peculiar vegetative power, 

 which the fummer poffeffes not in fo great 

 a degree ? So it appeared to me, although 

 the fummer was cold and rainy, like our 

 fprings, and the foil in the latter experi- 

 ment 



