122 



LSSSOJVS WITS PLANTS 



and then endeavor to match it in other leaves. He will soon 

 discover how difficult it is to describe a leaf with accuracy, and 

 he will also apprehend the greater truth that there are probably 

 not two leaves alike. 



XXII. VARIATION IN 



PLANT, AND ON 

 THE SAME KIND 



Fig. 119 

 Variable leaves of smilu. 



LEAVES ON THE SAME 

 DIFFERENT PLANTS OF 



134. The two bii-ch 

 leaves (Fig. 118) are from 

 the same tree. They differ 

 in size, shape, and denta- 

 tion (or toothing). There 



was also a difference in 

 color and in season of 

 maturity. Now, let the 

 pupil gather many leaves 

 from one plant, and deter- 

 mine if he can find any 

 two of them alike. He 

 will recall our studies of 

 the buds and branches, 

 and will be inclined to 

 conclude that there is uni- 

 versal difference in the 

 members of plants. 



135. The live oak 

 branch in Fig. 77 will now 



