THE LENTICELS, 87 



ordinary ones. We may therefore say with reason, that 

 ihese organs are the root-buds ; they differ from the 

 common buds, which produce branches with leaves or 

 flowers, both in the nature of their productions, and in 

 their form and their dispersion. They are distinguished 

 from bulbs, because these produce at the same time 

 roots and leaves, while the lenticels only give origin to 

 roots. They do not absorb any thing from the exterior, 

 as the Spongioles ; and do not appear by any means 

 destined for evaporation, as the Stomata. 



Their number, size and appearance vary much in 

 different trees, and often even in the species of the same 

 genus ; thus the Etwnymus verrucosus obtains its name 

 from its lenticels being very numerous and convex, whilst 

 in the other species they are almost flat and widely 

 dispersed. 



Circumstantial details of these organs may be found 

 in two memoirs which I have published upon the sub- 

 ject, in the Annates des Sciences Naturelles for 1826 and 

 1827. 



