OF THE MEDULLA OR PITH. 33 



incline therefore to the opinion that the medulla is 

 rather a reservoir of vital energy, even in these bulbous 

 grasses. 



Mr. Knight has shown that the part in question may 

 be removed without any great injury to a branch, or 

 at least without immediate injury ; but I have had no 

 opportunity of making any experiments on this parti- 

 cular subject. 



