LECT. X.] ANATOMY OF LEAVES. 581 



costae, also, are separated in a similar manner. 

 But in the smaller ramifications, we perceive that 

 many of the fasciculi are connected with each 

 other at nearly right angles; and in these in- 

 stances the vessels are not separations from the 

 larger fasciculi, but are distinct and merely applied 

 in a peculiar manner to the sides of those from 

 which they seem to arise ; as can be readily demon- 

 strated by dissection, with the aid of the micro- 

 scope. In this minute portion of a leaf of the Lilac, 

 sliced from between the cuticles, and examined, 

 by transmitted light, under a very high magni- 

 fying power, we observe that, in the smaller fasci- 

 culus (g. 28.), which is composed of seven spiral 



vessels, and united nearly at a right angle with 

 the larger fasciculus (h.), three of the vessels 

 (a.) form a curve upwards, and three (b.) a 

 curve downwards, before they unite with the 



p P 3 



