F. Pitt 



295 



that not only does the presence of pigment on the nose behave as a unit 

 character, but that it acts as a simple Mendelian dominant to the 

 absence of the pigment, expectation being exactly realised in every 

 instance. 



Six cleaned- 



nosed cows 



PP 



dam 



Primula 



(Vol. 47, p. 901) 



clean nose 



PP 



6 

 Newstead 



(30814) 



clean nose 



PP 



Newton Plum 



(Vol. 45, p. 370) 



dirty nose 



Bounds Chance 



(29544) 



clean nose 



PP 



Newton Glance 

 (35350) 

 dark nose 



? 

 Damson 



(Vol. 49, p. 749) 

 dark nose 

 Pp 



o 



Prune 



(Vol. 50) 



dark nose 



Pp 



New Plum 



(Vol. 50) 



dark nose 



Pp 



dam dam dam dam dam 



Dark Pearl Albyhes Cypress Gaylass Royal Girl Priscilla 



(Vol. 47, p. 901) (Vol. 47, p. 902) (Vol. 47, p. 900) (Vol. 48, p. 901) (Vol. 46, p. 851) 



clean no^^e clean nose clean nose clean nose clean nose 



p}} pp pp j)p pp 



Dia<?ram 6. Pedigree showing the inheritance of the dark or "dirty" nose through three generations. 

 The factor for pigment on the nose is indicated bj' P, and its absence by p. 



Except for the "purple" coat the dirty nose character is inherited 

 independently of other factors. I have seen a very white cow (grade — 3) 

 with a heavily spotted nose, and dark cattle (grade + 3) with perfectly 

 clean noses. The figures collected in relation to this are as follows : 



Dark-necked + 3 and - 

 Very white - 2 to — 4 

 Claret coloured 

 Pale brown ... 



Clean uose 



7 



7 



26 



9 



Spotted 

 1 

 

 

 



Heavily 



pigmented 







1 



15 



2 



The matings of clean-nosed with dirty-nosed cattle that I have 

 records of may be summarised as below : 



Newton Plum x Newstead (30814) 

 PPxpji do X Bounds Chance (29544) 



PP 











Pp pp 

 2 : 

 2 : 



Total 0:4:0 



Expectation ... 0:4:0 



Ppxpp Six clean-nosed cows X Newton Glance (35350) : 3:3 



Expectation 



: 3 

 19—3 



