THE AMARYLLIS FAMILY. 151 



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first "differs from the Liliacese in the inferior ovary," and 

 approaches the simple forms of the Iridacese, which, how- 

 ever, are distinguished by having three stamens instead of 

 six. 



NOTE. Exercises of this kind should be introduced and frequently 

 repeated, as soon as the pupil is in possession of a sufficient number of 

 observations to make intelligent comparisons. By this means the impor- 

 tant fact will become impressed on the mind, that groups of related 

 families may be recognized by their common characters, precisely as groups 

 of related genera are. 



