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fent the very minute globules of which thefe young and unformed 

 leaves were compofed. 



I have in another place faid, that there are no blood veflels 

 intermixed among the fmall fibres or flelhy ligaments of which a 

 flelhy fibre conlills ; but that the blood veirds which furround the 

 flelhy fibres, are placed in or between membranes ; and 1 have alio 

 laid down my idea^ how tar the flelhy fibres are nouriflied from the 

 blood veflels ; lb in this cafe, I fay, that all the leaves of trees and 

 plants are formed of globules (befidcs the veflels or fibres of the 

 leaves), all inclofed in a membrane conllituting the furface of the 

 leaf, and the manner in which, I imagine, that thefe globules, al- 

 though they touch no vcfTels, are yet nouriflied by the veflels, I 

 take to be this : we mull first underlland, that almoll all the leaves 

 of trees and plants, \\ hile united to the plant, confifl of two third 

 parts water or a watery fubftance, and that the globule?, of which 

 for the greatell part, the leaves confifl, do not lie fingly or feparate, 

 but many of them heaped together. Thus let us fuppofe jig. 7, 

 A B C D E, to be the veflels in a fmall piece of a leaf, and that thefe 

 veflels have a great quantity of globules, which in the nourifliment 

 of the leaf are fupplied and fupported by the veflels : then upon 

 the globule F receiving a fupply of nourifhment, particularly water, 

 from the veflels to which it is clofely conjoined, it mufl neceflarily 

 impart this nourifhment to G, and that the fame nutritive fubflance 

 will be conveyed from G to H, not only becaufe thefe globules are 

 clofely conjoined together, but alfb becaufe as before mentioned, 

 the greatefl part of the fubflance of the leaf, and confequently of 

 each globule, confifls of a watery matter or fubftance ; and thus, 

 thofe globules which are next the veflels, cannot receive any nou- 

 rifhment from them, but they muft impart of it to thofe globules 

 next to them, and thofe again to others. I have formerly com- 

 pared this communication of nourifhment to dry globules or balls 

 of clay, which we will fuppofe lying in a glafs, and only one of 

 tliofe balls to be made wet, and the moiftening being continued, 



