EAR COLOR VERSUS BUTTER COLOR, 231 



There is a striking resemblance between the various 

 glands in the plan of their formation ; and here, if 

 anj'where, we should, a priori, exjaect to find correla- 

 tions. It must be reinembered, however, that the 

 wax iu the cow's ear changes color by exposure to 

 the air, and consequently a freshly- exposed surface 

 must be examined iu the use of this indication. So 

 great is the resemblance between the ear-gland and 

 the milk gland, that in one case at least I have found 

 a similarity iu the size of the fat-globule in either. 



Experiment XI. 



No. 1. Very yellow in skin 

 and ears Guernsey. . 2J Iiighest colored butter. 



No. 2. Skin of udder not as 

 yellow as No. 1. Ears as 

 yellow Jersey. . . .Highest colored butter. 



No. 3. Skin middliug j'ellow, 

 do. ears " .... Good color to butter. 



No. 4. Skin rather light col- 

 ored " . ...Rather light colored butter. 



No. 5. Skin and ears yellow. . Ayrshire. .Yellow butter. 



No. 0. Skin and ears scarcely 

 showing color " . .White butter. 



Nos. 1, 2, 3, and 4 were on similar feed, and the 

 experimental butter Avas made from the same milking, 

 at the same time. Nos. 5 and 6 were on similar feed, 

 and the cows were selected on account of the varia- 

 tion in the color of the skin. The effect of the char- 

 acter of the food on the color of the secretions was 

 well illustrated by cow No. 6, which usually has 

 possessed more color of skin than at this trial. 



The melting point of Jersey butter, as obtained by 



