396 



metrically after Lyman. Tlie phosphorus-content was determined (also 

 after destruction) nephelometrically and also colorimelrically, after 

 Bell and Doisy's method altered by Briggs. 



Both l)allast-ex[)eriraent8 consisted of: an initial, and a final period, 

 each of a fortnight, in which the food-mixture contained S'/^ ballast; 

 intermediate periods of a week, in which the ballast was raised to 

 15 7o, respectively lowered to 3 "/, and the experimental periods 

 proper, each lasting a fortnight. In the first ballast-experiment there 

 were three experimental periods proper, the middle one with an 

 increased protein-content (lO'/o gluten of wheat) and cystin. During 

 this experiment 40 mgrms of Ca. (as Ca acetate) was given separately 

 per day, but only 15 mgrs in the final period. In the second 

 ballast-test calcium was administei-ed separately to such an amount 

 (at the most 12.7 mgrms per day) that the calcium-content of the 

 food was the same all through the experiment. 



As the diet (without cabbage) was composed of 3 parts of tlie 

 food-mixture and 1 part wheat, it contained less than 157, oat- 

 atraw, viz. 11'^, 7,. 



With a heightened percentage of ballast or protein, the procentic 

 amount of dextrin plus lactose in the food -mixture was lowered in 

 both experiments. 



The food was always made into a pap with boiling distilled water. 

 The gieen-fodder, and in other cases the calcium-acetate was admi- 

 nistered separately. The animal was weighed every three days. 

 The weight varied from 3530 to 3570 grammes. The average amounts 

 per day of calcium given off in the faeces and present in the food 

 in the various periods of the two ballast-experiments are expressed 

 in mgr. Ca in the following table: 



It appears distinctly from both experiments that the calcium- 

 output in the faeces is increased. The ratio of the output in the 

 initial period to that in the experimental period in the first experi- 



