2 PLANT BIOLOGY 



If the pupil extends his observation to animals, he 

 will still find the same truth ; for probably no two living 

 objects are exact duplicates. If any person finds two objects 

 that he thinks to be exactly alike, let him set to work to 



FIG. 2. No Two LEAVES ARE ALIKE. 



discover the differences, remembering that nothing in 

 nature is so small or apparently trivial as to be overlooked. 



Variation, or differences between organs and also be- 

 tween organisms, is one of the most significant facts in 

 nature. 



SUGGESTIONS. The first fact that the pupil should acquire 

 about plants is that no two are alike. The way to apprehend this 

 great fact is to see a plant accurately and then to compare it with 



