592 On the Composition of Ewes' Milk. 
The following was the composition of the milk before and 
after skimming : — 
New Milk. 
Skim Milk. 
87 -07 
3-27 
9-06 
89-81 
1-02 
10-17 
100-00 
100 00 
Specific gravity at 19° 0 
Percentage of cream on standing) 
per cent. 
•72 
1-032 
9 
per cent. 
•79 
at 15° C. 
1-035 
Feser's lactoscope indicated : — 
23 to 3 
Reviewing the preceding experiments, it will appear that 
although Feser's lactoscope does not give in all cases quite 
accurately the amount of butter-fat in milk, and shows certain 
descrepancies when milk is not quite fresh, it is nevertheless a 
very useful instrument for practical use. In most cases it shows 
without much trouble in a few minutes an approach to the real 
proportion of butter-fat in milk sufficiently near to enable an 
observer at once to form a pretty good estimate of the compara- 
tive richness of different samples of milk, and, in conjunction 
with the specific gravity test, to ascertain with certainty 
whether milk is genuine new milk or watered milk, and whe- 
ther milk has been partially or wholly skimmed, and at the 
same time whether it has been adulterated with little or much 
water. I can therefore recommend it to all persons interested 
in dairy matters. 
XXIX. — On the Composition of Ewes' Milk. By Dr. Augustus 
VOELCKER, F.R.S. 
There are not many analyses of ewes' and goats' milk on 
record, and having recently examined several samples of ewes' 
and goats' milk, I place the results on record, together with 
some others of ewes' milk which I obtained in former years. 
Ewes' milk, it will be seen, is more concentrated than cows' 
milk, and differs considerably in composition, more especially 
