POLYGAMOUS FACTORS 73 



Considering the possible errors, these figures are not 

 against the theory that the colours concerned are due 

 to single factors, but no more can they be taken as 

 completely satisfactory evidence in its favour. 



Among Highland cattle, crosses are made by which 

 the solution of single factors for each colour could be 

 tested, but here again the errors arising from mis- 

 description and non-registration of undesirable colours 

 are as prevalent as among Shorthorns. The crosses, 

 with the results they should give and the actual figures 

 obtained from volumes 13, 14, and 15 of the " Highland 

 Cattle Herd Book " are as follows : 



The colours which should not have been found are en- 

 closed within brackets. Excepting the brindles, they 

 will be seen to be few. The brindles may be neglected 



