60 



Mutability and Individual Variation. 



nificance, whereas the study of specific characters will 

 some clay form the most important branch of investiga- 

 tion in the whole domain of biology. 





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Fig. 15. ZeaMays tunicata {or cry ptosperma) . Three 

 ears from a sowing of seeds from the same ear. 

 The individual seeds are enclosed in the husks ; in 

 A however, incompletely covered about the middle 

 of the ear, and almost naked at the top. C is the 

 intermediate form ; B has, especially l3elow, very 

 large husks. 



Continuous Variation of Elementary Specific Char- 

 acters. — The difference between fluctuation and mutation 

 perhaps comes out most clearly in this connection. By 



