Se&.V, Agriculture and Vegetation. 199 



AMONGST the clafs of external accidents 

 we may place the ef&dts which arife from 

 the contiguity of certain plants. There are 

 fome plants which do not thrive in the 

 neighbourhood of others. This is obferved 

 of the cabbage and cyclamens, of hemlock 

 and rue, of reeds and fern. We have many 

 examples of fuch like antipathies amongft 

 animals. Thefe effects feem to be produced 

 by the effluvia which are emitted by all 

 organised bodies. 



IT is furpriling that the prefent fubjed:, 

 fo highly neceflary to the proper culture of 

 plants, mould have been almoft entirely 

 neglected ; fo that an inquirer finds too 

 few fads and obfervations to be able to 

 lay down any regular fyftem. Befides, the 

 difeafes of vegetables feem to require more 

 amftance, and therefore demand more at- 

 tention, than thofe of animals ; if we regard 

 the cure alone, and fet afide the higher rank 

 in the fcale of creation, and confequently 

 O 4 the 



