196 
Proceedings of the Royal Society of Edinburgh. [Sess. 
He. investigated the effect of adding calcium phosphate to the milk fed to 
calves. He found, contrary to the earlier work of Neumann,* that the 
calcium phosphate had no injurious action, and that it even appeared 
doubtful if it had any efiect at all. 
The influence of the addition of various salts to fodder on the com- 
position and yield of the milk produced was further studied by Von 
Wendt. j* The salts experimented with were sodium chloride, calcium 
carbonate, sodium phosphate, magnesium bromide, calcium glycero-phos- 
phate, and calcium hydrogen phosphate, and he concluded that none of 
these salts influenced the composition of the milk in any deflnite way. 
Calcium hydrogen phosphate, however, was considered to increase the 
yield and generally to a slight extent the amount of calcium. 
In 1911 Fingerlingf tried the effect of food deficient in calcium and 
phosphoric acid on the secretion of milk. When these are deficient in 
food they are, for some time, provided by the organism without diminish- 
ing the activity of the milk glands. He concludes that the percentages 
of calcium and phosphorus in milk are only slightly affected by deficient 
feeding, and tend to increase rather than diminish. 
For the present investigation six cows of the dairy shorthorn breed 
were selected, as nearly equal as possible in regard to age and period 
of lactation. They were then divided into two lots of three each. The 
yield of milk given by each cow was determined at every milking by 
weighing. Weekly samples of the milk of each cow were also taken 
for analysis, and the percentages of phosphoric acid, ash, fat, and “ solids 
not fat” determined. 
The experiment was commenced on 10th December, and for flve weeks 
all the cows were fed alike and received the followinp; ration : — 
O 
75 lb. turnips. 
4 „ Bombay cotton cake. 
1 „ bran. 
8 „ hay. 
Straw {ad lib.). 
The mineral matter in this ration, exclusive of the straw, contained 
about *5 lb. of calcium phosphate. 
The analyses made during this preliminary period (Tables I and II) 
showed that the percentage of phosphoric acid and mineral matter in the 
milk of each cow was relatively constant, although there were slight 
* J. Landw., 1894, xlii, 33. 
t Ghem. Gentr., 1908, ii, 1881 ; Ghem. Soc. Jour., xcvi (1909), ii, 164. 
; Landw. Versuchs-Stat., 1911, Ixxv, 1 ; Ghem. Soc. Jour., c (1911), ii, 510. 
