292, ’ REPORT OF THE CHEMIST OF THE 
applied for the purpose of detecting any difference are the well- 
known tests given in the last table, but the Iodine and Viscosity 
tests were the ones to show most plainly the difference. The 
Todine number indicates the amount of olein present and the vis- 
cosity test of the butter soaps marks the slightest changes in the 
composition and physical properties of the fats. The figures given 
are not the. results of single trials, but the average for a number 
of tests. 
As indicated by the Iodine number, between the butter produced 
under corn meal feed and that produced under linseed meal feed 
there is a difference of nearly 3.5 per cent in the olein. The cows 
under linseed meal feed preduced a butter having the higher per 
cent of olein, and this was true in both series of trials with two 
- animals in each case. The butter under wheat bran feed gave the 
lowest Iodine number, although immediately following linseed 
meal. 
The viscosity of the soap solutions of the butter fats under the 
different feeds were as follows in the two series of trials: 
A a g. a nar ee oO. 
Tae Ten 4 a PM see. 4s aia, atze be dye te chat se at ees 78 ee 
COOTT MNORL LOGO 00h bol a's bat adtece Wis ae se alee eam ero 63 151 
MEIMBGCCIIN OBL TOOC os cite cin Nitec rota iota! Maat Weal 2 ee 102 286 
WV OED ANET 1OCU 26 cunts ity iecre lk a alu aU ae gece ae pon ee 74 124 
Taking the Iodine number and the viscosity of the soaps for the 
butter fats as an indication of changes in composition, we are led 
to conclude that food may effect the composition of butter fats. 
FEEDING EXPERIMENT. 
BESS AND JESS. 
At the beginning of this trial, December 15, the two heifers, 
Bess and Jess, were two years and six months old, having been 
purchased by the Station July 14, 1885, at five weeks old. From 
the time of their arrival at the Station to the beginning of the 
present feeding, 880 days, Bess increased in live weight 1,014 
pounds, or 1.24 pounds per day on the average, while Jess for the 
same period made an increase in live weight of 811 pounds, or 
0.92 pounds per day. At the beginning of this trial Bess weighed 
1,106 pounds and Jess 903 pounds. | 
m4 est : 4 
Ss w* See" 2 nae 
