PHYSICAL AND LITERARY. 30^ 



them, but increafed, and came to matu- 

 rity, quite full of feeds. Sec alfo Gar- 

 dener's Dictionary, article Generation, near 

 the end. 



48. Thus I think I have fufficiently an- 

 fwered all the arguments for the fexes of 

 plants, taken either from the flruaure of 

 flowers, or experiments of any confe- 

 quence that I could meet with. But, fince 

 no fmall ftrefs feems ftill to be laid on 

 the analogy between plants and animals, 

 as much favouring this dodlrine, I muft 

 beg leave, a little to confider it alfo, al- 

 tho' it is certainly true, to ufe Mr Need- 

 ham's words *, that the method of rea- 

 foning by analogy, is but too apt to lead 

 us into miftakes ; and therefore we oughc 

 to be very diffident of confequences de- 

 duced this way : For mere analogy, found- 

 ed on fads, and extended by conjedlure, 

 however plaufible, can, at moft, but fur- 

 nifh motives for a reafonable doubt, and 

 further inquiry. 



49. *' Omne vivum ex ovo ; per con- 

 ** fequens etiam vegetabilia : Ovum, non 



** fcecun- 



* Phil. Tranf. No 490; 



