72 Report oF DEPARTMENT OF ANIMAL HUSBANDRY OF THE 
and only 15.6 grams daily from May 26 to June 16, and at the end 
of the 27 days she was found to be losing an average of 26 grams 
per day. 
On the other hand, when the supply of phosphorus was liberal 
(Ration 2) there was a storage of that element in the body of the 
cow, amounting in one period to an average of 8 grams daily, while 
in another the average was 13 grams. , 
The proportionate distribution of the outgoing phosphorus among 
its various compounds was quite unlike what was found in the food. 
Through catabolic changes all, or nearly all, the phosphorus of the 
phytin and of the unused digested proteids was reduced to inorganic 
forms which were excreted. The variations in the quantities of the 
outgoing phosphorus in the several periods were found, therefore, 
to consist almost wholly of changes in the proportions of inorganic 
salts of this element in the egesta. The data furnish no evidence 
that any synthesis of the phosphorus-bearing proteids occurred. The 
quantities of these latter bodies in the milk and egesta appear in no 
case to be materially greater than the food supply. (See Tables 6-9.) 
4. Distribution of outgoing phosphorus compounds in the milk 
and egesta,—Variations in the amount of outgoing phosphorus, cor- 
responding to the rise and fall of phosphorus compounds in the 
rations, took place chiefly in the feces, though to a small extent in 
the urine. Moreover, as previously indicated, this increase or de- 
crease in the phosphorus bodies of the egesta was found to occur 
almost wholly with the inorganic salts. The percentage of these 
salts in the milk suffered no appreciable change. The proportions of 
organic phosphorus bodies remained fairly constant in the milk and 
egesta in spite of marked changes in the quantities of the ingested 
phosphorus compounds. It is especially noteworthy that the secre- 
tion of casein, the characteristic nucleo-proteid of milk, seemed to be 
in no way affected by the food supply of similar bodies or by varia- 
tions in the phosphorus supply in other forms of combination, even 
when there was a phosphorus deficiency during a long period. (See 
Tables 6-0.) 
5.-Physiological effects due to variations in the phosphorus bodies 
of the two rations——No evidence appears that the increase or de- 
crease of the phosphorus compounds in the ration influenced either 
the digestibility of the total dry matter or of the nitrogen com- 
