128 On Heterochromia Iridis in Man and Animals 



shorthorn cattle, in which he puts forward a chemical theory of " Ihtra- 

 zygotic inhibition and reaction in response to specific set (? genetic) 

 conditions," p. 27, and alludes to the possibility that " unit characters 

 may arise from a partial destruction of larger units, and that a determiner 

 for a unit character behaving precisely in unit fashion may be a 

 'complex' capable of being shattered into a large number of inde- 

 pendently behaving characters," p. 26. 



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