tfhe Conchtfion. ^67 



of which the parts of Vegetables are formed, 

 and without which the watry vehicle alone 

 cannot render a barren foil fruitful. 



Nor is this the only care : The thriving 

 and fertility of plants and trees depends 

 much upon the happy influence and con- 

 currence of a great variety of other cir- 

 cumftances. Thus many trees are unfruit- 

 ful by being planted too deep, whereby 

 their roots being in too moid: a ftate, and 

 too far from the proper influence of the 

 Sun, whofe power greatly decreafes, the 

 deeper we go, as we fee in Experiment 20. 

 they imbibe too much crude moifture, which, 

 tho' productive of wood, is yet unkindly for 

 fruit. 



Or if, when not planted too deep, they 

 are full of crude fap, either by being too 

 luxurious, or too much fhaded ; or are 

 planted in a moift, when they delight in a 

 dry foil, then the flip is not ib fufficiently 

 digefted by the Sun's warmth, as to be in 

 that ductile ftate, which is proper for the 

 producing of fruit. 



And thus the Vine, which is known to 

 thrive well in a dry, gravelly, rocky foil, 

 will not be fo fruitful in a moid:, ft iff, clay 

 ground: And accordingly we may obferve 



in 



