SIMILAR DISEASES. 349 



whose petals are, not uncommonly, stained 

 all over with this powder. Our knowledge on 

 all these subjects is yet in its infancy ; but it 

 is to be hoped, now the pursuit of agriculture 

 and of philosophical botany begin to be, in 

 some distinguished instances, united, such 

 examples will be followed, and science di- 

 rected to one of its best ends, that of im- 

 proving useful arts. And here I cannot but 

 mention the experiments continually going on 

 under the inspection of the ingenious Mr. 

 Knight, of fertilizing the germen of one spe- 

 cies or variety with the pollen of another 

 nearly akin, as in apples, garden peas, &c, 

 by which, judiciously managed, the advan- 

 tages of different kinds are combined. By 

 the same means Linnaeus obtained interme- 

 diate species or varieties of several plants ; 

 and if any thing were wanting to confirm his 

 theory respecting the stamens and pistils, this 

 alone would place it out of all uncertainty. 



