152 THE FIRST BOOK OF BOTANY. 



tation. This relation is an impressive one, and prominent in 

 classification ; but there is no need of haste in getting to it. By- 

 and-by, when the leaves of his growing plants are well developed, 

 by the aid of his note-book, the pupil might be put in the way of 

 discovery, by asking him to make a list of his monocotyledons, 

 and to give their venation in each case. Let him do the same 

 with his dicotyledons. He will now see a perfect uniformity 

 of relation in a few cases, and will be curious to know if it is 

 everywhere constant. He will thus arrive at the induction by 

 his own observation. 



