Gruenon Examined. 35 



scure the fact or foundation of the Yield Mark ; for it 

 results from the force of weight strain, and the law of 

 gravitation, and will stand as the effect and index of yield, 

 established by the milk weight, as long as the custom of 

 storing milk in the udder, and the weight pressure of milk 

 in the bottom of the bag shall continue. 



The different sizes and forms of Yield Mark are rep- 

 resentative consequences of the difference in yield and its 

 weight strain,* and in the outline figures and underlying 

 flesh in the posterior parts, where the Yield Mark is 

 formed, on ninety per cent of all the best milk cows in 

 Europe and America. 



*Difl;ereiiCL' in size in Yikld Mark on botli same size and different sized 

 of cows is siiown in Plates I. and XL and tlie variations inform are explained 

 in chapter 5 on variations in form of YniLD Marks. 



Mr. Milton Mackio, of Massachusetts, informs us that cows that are \\()rked, 

 but not milked, at Emms. Germany, have only very small Yield Marks, or 

 none at all, having no milk weight strain to produce the Marks of Yield. 



