142 PHILOSOPHICAL NOTES ON 



All teeth of plants correspond to atrophied leaflets and leaves, 

 or, homologously, to atrophied branches. This is the reason we 

 find "vascular bundles from the ribs and nerves of leaves 

 extending into the serrate projections of the margin."* 



This means that the serrate projections we call teeth, and which 

 receive a vascular bundle, are comparable to branches of the leaf, 

 and, as such, comparable to branches of the stem. 



The reader might say and " What about glands and hairs " ? 

 These I have discussed elsewhere. 



* Bower, " Pract. Bot.," 3rd edit., p. 124. 



