(-19) 



they appeared to me, a rcprelentation of which is given at fig. 4. 

 I K L M. In this fmall particle, I not only judged that there Nvere 

 about a thouland vcllels taking their courfe upwards, but. it alio 

 gave me a rcprelentation of a complete branch of tiie tree cut tranf- 

 verfely ; for the external furface reprefented the bark; the part next 

 it, in which are very fmall dark fpots, denoted the wood; which dark 

 colour was only caufed by this, that in cutting the flice, the knife 

 had Iqueezed together, or Itopped, the fmall tubes or veflels of which 

 it was compofed ; the middle part, the fap, or thofe veflels which 

 would produce the Item or branch, and being cut tranfverfely, ap- 

 peared round bodies. But this figure was drawn from a microfcope 

 of greater magnifying power than that ufed in the former, in order 

 to fhew the nature of this flem and root more ditlinftly, fb that the 

 diameter of this figure at I L, is about twice the diameter of the part 

 marked in the lall figure by B G. 



]Sroreover, in this fmall trunk or flem, I perceived in fo me places, 

 fome round particles, as if they were fmall round corpufcles in the 

 tubes or velfels, which are reprefented between the letters A 

 and B. 



I have thought it right here to exhibit the fize of the young 

 leaves in the feeds of fome other trees, to fhew that it by no means 

 follows of confequence, that the largell feeds contain the largeft 

 rudiments, or originals, of their future plants, for the young plants 

 in the fmall feeds of the Afli are vatlly luperior in fize to the very 

 fmall leaves which the large feed of the Walnut contains, and 

 which, as feen by the microfcope, are fhewn at jig. 5 and 0, the 

 origmals of which I took from two feeds of that fpecies, in order 

 to note if there might be any material difference between any two 

 of them. In thefe figures I have only reprefented the leaves, be- 

 caufe in the rudiments or originals of the future flems and roots, 

 (which in this feed are fomevvhat longer than the leaves), I per- 

 ceived little or no difi'erence in the form from thole in other feeds. 

 In drawing thefe two figures, I found it quite impofTible to repre- 



VoL. II. G 



