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Bi 



6i^m6¥5«i 



BB 



B 



B 



INHERITANCE CHART OF BI-LOBED EAR 



The squares represent males, the circles females, affected individuals being designated in 

 black. As may be seen, both sexes appear to be affected equally and indifferently. (Fig. 20. ") 



A Study of Bud Variations in Coleus 



One of the most valuable recent con- 

 tributions to the study of ev^olution is 

 that of A. B. Stout, director of the 

 laboratories of the New York Botanic 

 Gardens (CarncKne Inst. Washinj^ton 

 Pub. 218). He started with a sinj^le 

 variety of Coleus, an ornamental plant 

 much used for beddinjj; and in pots for 

 indfjor disjjlay. This was projmj^ated 

 by cutting's and showed both j^radual 

 fluctuations and abrupt mutations, six- 

 teen distinct and characteristically dif- 

 ferent color i)atterns beinj^ eventually 

 produced. The results are interi)reted 

 by Dr. Stout to mean that slij^'ht varia- 

 tions, arising cither suddenly or j;rad- 

 ually, can perpetuate themselves, as 

 Darwin supposed but as some recent 



518 



bioloj^nsts have denied. It is claimed 

 that bud mutations in Coleus are com- 

 mon, result in numerous difTerent types 

 which may be vegetatively constant 

 from the first or can be made so by 

 selection, show development of certain 

 tyjjes more commonly than others, i)ro- 

 duce reversions to parental types, give 

 dcveloi^ment of difTerent degrees of 

 variability among sister clons, and ex- 

 hibit spontaneous changes in the funda- 

 mental color patterns and in the cellular 

 and tissue patterns resulting in color 

 patterns. Sexual and asexual repro- 

 duction are therefore believed to be not 

 fundamentally difTerent in respect to 

 extent and range of variation. 



