VII. SCIENCE IN HER CELLS. 137 



for discussion, so far as this first figure goes, without 

 wanting one letter of all his three and twenty ! 



17. But on the next page, this ingenious author gives 

 us a new figure, which professes to represent the same 

 order of things in a longitudinal section ; and in retrac- 

 ing that order sideways, instead of looking down, he not 

 only introduces new terras, but misses one of his old lay- 

 ers in doing so, thus : 



His order, in explaining Figure 9G, contains, as above, 

 nine members of the tree stem. 



But his order, in explaining Figure 97, contains only 

 eight, thus : 



(1) The pith. , 



Medullary sheath. \ 



(3) Medullary ray = a Radius. 



<4> Vascular zone, with woody fibres (not now ves- 

 sels !) The fibres are composed of spiral, annular, pitted, 

 and other vessels. 



(5) Inner bark or 4 liber,' with layer of cambium 

 cells. 



(6) Second layer of bark, or ' cellular envelope,' with 

 laticiferous vessels. 



(7) Outer or tuberous layer of bark. 

 v Epidermis. 



Doing the best I can to get at the muddle-headed gen- 

 tleman's meaning, it appears, by the lettering of his 

 Figure 97, my 25 above, that the f liber,' number 5, con- 

 tains the cambium layer in the middle of it. The part 



