Seel. I. Agriculture and Vegetation. J 



attain the truth ; or by thofe who, although 

 Nature has been very bountiful, cannot 

 carry their fchemes into execution, from 

 the narrownefs of their fortunes. The 

 former can never know more than what 

 they have learned from their fathers; the 

 latter dare rifk nothing, as their daily bread 

 depends on the certainty of fuccefs. What 

 can be expected from that clafs ? 



LET us fuppofe the fortune eafy, and 

 the judgment improved, the difficulty of 

 the art itfelf is fufficient to retard its pro- 

 grefs. How delicate the circumftances that 

 muft attend each experiment! What a 

 number of different obfervations on heat 

 and cold, dry and wet, difference of foils, 

 grains, feafons, &c. muft be exactly made, 

 before one can be certain of the general 

 fuccefs of an experiment ! What a dif- 

 agreement from a fmall difference in one of 

 thefe circumftances ! How feldom can thefe 

 experiments be repeated, which take a 

 whole year before they can be brought to 

 B 2 a 



