4:oS 'i'llK JolKXAl. OF I ll'.KKDITV 



at various aj^cs and K^ivin^ the pounds each maternal card, one in which the 



of milk yielded, pounds of fat and per age of the cow and of the grandam 



cent, of fat. corresponded very closely. This ar- 



Thc difficult \- of variation in age was rangemcnt left 665 cards in each group, 



overcome by arranging the "paternal The coefficient of correlation for 



grandam" and "maternal grandam" each group in respect to total milk, 



cards in two parallel sets. Having a total fat and per cent, of fat, is shown 



much larger number in the i)aternal set below: 

 it was possil)le to select therefrom, for 



SUMMARY OF RESULTS. 

 Pounds of Milk 

 Through Sires 



M Em o- Eo- r Er 



Granddaughters 370.6 ±2.29 88.5 ±1.67 -0.05 ±0.025 



Gran.lams 475.3 ±2.56 98.7 ±1.95 -0.05 ±0.025 



Through Dams 



Granddaughters 393.4 ±2.63 99.5 ±1.95 -0.012 ±0.02 



Grandams 437.4 ±2.09 80.8 ±1.54 



Pounds of Butter-fat 

 Through Sires 



Granddaughters 12.68 ±0.089 3.41 ±0.062 -0.04 ±0.025 



Grandams 16.93 ±0.108 4.14 ±0.076 



Through Dams 



Granddaughters 14.00 ±0.101 3.97 ±0.07 0.06 ±0.026 



Grandams 15.83 ±0.087 3.31 ±0.06 



Percentage of Butter-fat 

 Through Sires 



Granddaughters 3.47 ±0.009 ± .432 ±0.008 0. 107 ±0.02 



Grandams 3.57 ±0.011 ±.448 ±0.008 



Through Dams 



Granddaughters 3.55 ±0.011 ± .445 ±().00S 0.213 ±0.02 



Cirandams ^50 ±0.013 ± .488 ±0.009 



Taking the opposing pairs of cards as granddaughter and grandam the follow- 

 they came to sec in which there was the ing results were obtained ; 

 greatest similarity between records of 



Number cases in wliich , .Number eases in whieli 

 resemblanee was elosest resemblance was closest 

 on Maternal side. on l^iternal side. 



Pounds of milk 



Pounds of Butter-Fat. . 



Per r(nt. of Rutter-Fnt 



403 

 407 



345 



262 



258 

 MO 



In llic two sets of cases already due to fact lliat cows have nian\- more 

 discussed there was a smaller number of granddatighlers ihrotigh their sons tlian 

 paternal than oi maternal grandams, through their dauglUers. This objee- 



