SUPPRESSED EFFECTS 53 



which brings their total to 16, they will be found to be 

 to each other in the ratio 9-16 : 6"84 ; that is, approxi- 

 mately 9 : 7. 



There is a striking contrast between these colourless 

 flowers and the albino rabbits. The progeny of two 

 albino rabbits are always albinos. If, for instance, an 

 albino having the factors for grey be mated with another 

 having the factors for black, the materials offered are 

 XYZc and XyZc ; and the recessive factor c, which is 

 concurrent with albinism, must be carried by all the 

 progeny. In the present case, however, both parents 

 must carry factors for whiteness which must be different : 

 else their hybrids would also be colourless. And both 

 these factors must be recessive to factors having to do 

 with colour production : else again their hybrids would 

 be colourless. 



In connexion with albinism and colourlessness, the 

 word " white " needs to be closely watched, in case an 

 animal or plant popularly called " white " but yet not 

 white should be mistaken for an albino or a true white. 

 Among fowl there are certain so-called white breeds 

 having small specks of colour, sometimes no more than 

 a very few feathers. But such fowl are not truly white 

 and must carry a factor concurrent with the production 

 of colour. Similarly the " wild white " cattle of the 

 English parks are not true whites, for small portions 

 about the eyes, ears, and legs are coloured either black 

 or red. It is an historical fact that these cattle have 

 occasionally thrown black and red calves, and, within 

 recent years, two which had black " points " and were 

 confined in the London Zoological Gardens actually 

 threw black calves. These are therefore coloured cattle 

 carrying a factor for blackness — or redness — together 



