[ 9 ] 



not myfelf to a mathematical clofenefs, I fliall 

 endeavour not to go out of view of my fubjeft. 



Whence, it is proper to moralize a lit- 

 tle upon the precedent fpoken of ; as that 

 there muft be aifeftions in nature to co- 

 operate with the intermediate mechanitian, 

 or he will lofe the field inftead of gaining 

 an entire conqueft. But how ticklifh in 

 themfelves, and how occult to us thofe af- 

 fedlions are in the cafe of engrafting, (as far 

 as that will weigh) is furprifingly evident, 

 from fome experiments I made out of mere 

 curiofity. For altho* the cyon of a rich 

 tafted fpecies of pear, will with kind paffi- 

 on unite with the rough juice of a quince 

 ftock 5 Or the cyon of an apple of like ex- 

 cellence, with the harfheft crab : Yet will 

 neither grow vice verfa ; to be of any dura- 

 tion. Viz, a quince upon a lufcious pear, or 

 a crab upon a high flavoured apple ftock. 

 Thus there is required a conformable power 

 in the agent, and an aptitude of difpofition 

 in the patient, to make an efFeft in nature 

 certain — regular — and lafting.— 



But maxims without examples given, lofc 

 half their force. Whence I was induced to 



recite 



