PLATE 28 



A-B. — A cow (No. 650) and her calf, showing the effect of a ration of com grain, 

 com stover, and organic salts. The physiological soundness of an all-corn plan- 

 tation was not disturbed by altering the relation of base and acid radicles. Both calf 

 and mother appeared perfectly normal. 



C-D. A cow (No. 594) and her calf, showing the effect of a ration of com grain, 

 com stover, and a mixture of inorganic bases as carbonates. The calf was strong and 

 weighed 108 pounds when bom. The efficiency of the ration was not destroyed by 

 a change in the relation of bases to acids. 



E-F. — A cow (No. 647) and her calf, showing the effect of a ration of com grain, 

 com stover, and magnesium citrate. Even additions of magnesium salts alone in 

 quantities sufficient to make the ratio of calcium to magnesium i to 2 did not destroy 

 the efficiency for reproduction of an otherwise good ration. The mother and calf were 

 strong and apparently normal. 



