The Conchjion. ^61 



fame nourifhment, is doubtlefs owing to the 

 very different formation of their minute vef- 

 fels, whereby an almoft infinite variety of 

 combinations of the common principles of 

 Vegetables is made ; whence fome abound 

 more with fome principles, and fome with 

 others. Hence fome are of a warmer and 

 more fulphureous, others of a more watry, 

 faline, and therefore colder nature 5 fome of a 

 more firm and lafling, others of a more lax 

 and perifhable conftitution. Hence alio it is 

 that fome plants flourish befl in one climate, 

 and others in another ; that much moifture is 

 kindly to fome, and hurtful to others ; that 

 fome require a ftrong, rich, and others a poor, 

 fandy foil ; fome do bell: in the (hade, and 

 others in the fun, &c. And could our eyes 

 attain to a fight of the admirable texture of 

 the parts on which the fpecifick differences in 

 plants depend, what an amazing and beautiful 

 fcene of inimitable embroidery fhould we be- 

 hold ? what a variety of mafterly ftrokes of 

 machinery? what evident marks of confum- 

 mate wifdom fhould we be entertained with ? 



We may oblerve, that the conftitution of 

 plants is curioufly adapted to the prefent fiate 

 of things, fo as to be mod flourifhing and 

 vigorous in a middle (rate of the air, viz. 



when 



