t 37 ] 



family ufe. Thefc two fpecies are all I hadat that 

 timei from which the apples which produced the 

 feeds were promifcuoufly gathered in the fame field, 

 and fown together in the fame fpot. 



The Dodor feems to doubt if the fexual fyftem 

 of Linnaeus takes place in the propagation of new 

 varieties in this ufeful plantj but it feems very cer- 

 tain from the above account, that varieties of them 

 are attainable from feed, and that mod probably by 

 the bloffoms of fome plants being impregnated with 

 the male dull of others, fimilar to what happens to 

 the whole tribe of cabbages, carrots, and parfnips, 

 beets, 6cc. If this be not admitted, we muft have 

 recourfe for a folution to feminal variations in the 

 primitive fenfe of the phrafe^ which is not only in- 

 finitely more improbable, but perhaps totally inad- 

 miffible and irreconcilable to the principles of found 

 philofophy. Nothing can be more certain, than 

 that the moft minute variation muft have had a 

 pre-exifting caufe competent to its produdbion; 

 otherwife it unavoidably follows that an efl^edb may 

 be produced and exift without any caufe at all, 

 which is abfurd and impoflible. 



That the pea tribe continue invariably the fame, 



though they (hould be reared in the moft promifcu- 



ous manner, the Dodor feems fully convinced, and 



D 3 1 have 



