426 



Tlie author jrives the following averages and variations for the milk 

 of the cows imder trial during the whole year : 



Averages and variationn of tht milk fur J t/ear. 



Fat 



Total 80li<l» 



Solidsuotfat. .. 

 Bjiecific gravity 



Averages 

 for the 

 year. 



Variii Lions. 



Per cent. 

 a. 214 



n.:r« 



6.54I 



In the day's { In the milk of 

 milk. Mingle milk ings. 



Per cffif. 



2. g27 - 3. 746 

 10. K" -12..'J'*i 

 7.747 - l«. 7x1 

 1.0275- 1.0012 



Percent. 

 2.415 - 3.997 

 9. iiS -12. ti84 

 7. 033 - 8. 872 

 1. 0252- 1. U315 



Minima for the milk of the tchole herd. 



Fat 



ToUl solidn 



Solids not fat .. 

 Sp©ciflc gravity 



1888-89. I 1887-«8. 



Per rent. Pert»U 

 2.415 , 2.591 

 9.448 11.091 



7.0S3 8.211 



L0252 I 1.0296 



The specific gravity of the sjilids wa.s at no tinu' over \.'M\\ in 188S-.'^1> 

 and 1.374 in 1887-88. The antlior was snr|»ri.><iMl to find tliat the spetilic 

 gravity of tlio mixed milk of tlie honl of lL't> row.s was on one (Kcasi«>n 

 as low as 1,(I2."»1* (at \~>^ C). This oi-cnncd on the evening of May 'JO, 

 1880, on the second day after the cows had been turned <»ut to pasture. 



OhHcrrntlons on the milk of siiufle roirn. — As mentioned alcove, these 

 ob.servations were ina<lt' on H» rows and extended throughout the perii»d 

 of lactation. Tiie objects were tolixtlie bounds (»f individual variation 

 of co\ys of this l)n'cd with res[>cct t<» quantity and tjuality of milk, 

 and to secure extensive ami reliable data which might possibly be of 

 value in studying the ]>hysiology of milk s«'<retion. In selecting the 

 cows, those were taken whiili had calved at about the same time. The 

 observations «'ommenced April S on 1.") cows which had calve<l betw« en 

 January 28 antl ^Nlarch .{O. The sixteenth <ow calve<l April 30, and 

 observations were commenced at once. For those cows which had 

 calved previous to the beginning of the experiment the total amounts 

 of milk an«l V>ntt<'r yielded by each up to the time the experiment 

 commenced are given. The cows were all fe<l alike when well, the f«tod 

 being the same as that of the whole herd on which observations are 

 reported above. From May 18 to kSeptember 30 the cows were at 

 pasture, receiving during that tirtie aiblitional foml in the form of 

 brewers' grains, wheat bran, or rye. While fed in the barn 4.2.">— 1.7."» kg. 

 per day of a grain mixture (compo.sed of I kg. each. of ground mixed 

 grains and brewers' grains, 1 or 1.5 kg. of wheat bran, 0.75 kg. of 

 sunflower-seed cake, and 0.2."> kg, each of peanut meal and palm nut 

 cake) was fed to each cow as long as she lemained iu milk. To this 



