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SEEDS, BUDS, BULBS. 



Sect. IX, 2. gv 



umbilical vefl'els called femuial roots, which are vifible in many 



feeds. 



That this fyftem of umbilical vefTels is pofleffed of a great power 

 of abforption in the roots of trees is certain from the force, with which 

 the fap-juice was propelled upward from a vine-ftump in Dr. Hales* 

 -experiment. That the fap-juice thus propelled upwards nourifhes or 

 expands the leaf of each new bud appears from the experiments of 

 Dr.Walker; as the leaves began to unfold at the fame height, as the 

 wounded wood began to bleed, and that thefe vefTels pafs through or 

 Conftitute the fap-wood is evinced by the growth of the buds on oak- 

 trees, after the bark is almofl: totally taken off. 



• The roots of trees are at this time protruded with greater vigour, as 

 obfervcd by the ingenious Mr. Bradley, who on that account prefers 

 the midfummer feafon for tranfplanting trees, if they are not to be 

 removed to any great diflance ; and adds, that the new llioots in th@ 

 following fpring will put forth with much greater force, and the tree 

 will thence be almoft a year forwarder in its growth, than if it re- 

 mains untranfplanted till the winter. Difcourfes on Earth ^nd Wa- 



p 



This feems to be owino: to the deftrutftion of much of the nu- 



ter. 



tritious matter depofited in the roots for the ufe of the new buds, 

 which is torn off in tranfplanting, and which can only be replaced 

 about Midfummer or foon after. 



Mr. Bradley further adds, that when trees are thus tranfplanted 

 at Midfummer, no part of the top or branches, or foliage, fliould at 

 that time be cut off; which well accords with the theory above de- 

 livered ; as it is from the vegetable blood, which is oxygenated by 

 its expofure to the air through the thin moift pellicle on the upper 

 fm.ooth furfaces of thefe leaves, that the nutriment for the expan- 

 iion of the buds in the fucceeding fpring is fecreted or produced; and 

 hence if thefe leaves are prematurely deftroyed, the vernal growth 

 of the buds mufi receive injury ; as the refervoir of future nutriment 

 for them will be lefs in quantity 3 but if fome of the branches are 



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