1 8 



Scientific Proceedings (6i). 



L, suprasternal notch to upper border of pubes. 



M, circumference of abdomen at level of umbilicus. 



N, circumference of thorax at level of nipples in the male, and 



just above breasts in the female. 

 Thighs, 0{P + Q), 0.508. 



0, superior border of the great trochanter to the lower border of 

 the patella. 



P, circumference of thigh just below the level of the perineum. 

 Q, circumference of hips and buttocks at level of trochanters. 

 Legs, RS, 1.40. 



R, from sole of foot to lower border of patella. 

 S, circumference at level of lower border of patella. 

 Feet, T(U + V), 1.04. 

 T, length of foot. 



U, circumference of foot at base of little toe. 

 V, smallest circumference of ankle. 



11 (943) 



On the law relating milk flow to age in dairy cattle. 



By Raymond Pearl. 



[From the Biological Laboratory of the Maine Agricultural Experi- 

 ment Station.] 1 



Before the production records of different cows may be criti- 

 cally compared, as in the study of the inheritance of milk flow, 

 for example, it is necessary to make proper corrections for the 

 differing ages of the individuals compared. It has long been a 

 matter of common knowledge that there is a change in amount of 

 milk produced as a cow grows older. Before any proper correc- 

 tions for this factor can be applied it is essential to determine 

 with precision, and, so far as may be, generality, the quantitative 

 law connecting these two characters milk flow and age. By the 

 associations and individuals who have in charge the Advanced 

 Registry records in all of the dairy breeds of cattle it is generally, 

 and quite erroneously, assumed that the relation between these 

 two variables is a strictly linear one. 



1 Paper No. 74. 



