FEEDING EXPERIMENTS WITH ISOLATED FOOD SUBSTANCES. 



51 



sugar 15, starch 29.5, lard 30, agar 5, salt mixture I 2.5, and nitrogen 

 2.97 per cent. 



Table XXX. Summary of Data on Rat 73, fed for 181 Days on a Mixture 

 Containing Casein and Zein as the Only Proteins and for 53 Days on one 

 containing Pea Legumin as the sole Protein. Daily Averages. 



Period i, 181 Days. Casein 12 percent, Zein 6 per cent. 



These observations have thus shown the sufficiency of the arti- 

 ficial dietaries to maintain full-grown small animals for long periods 

 of time (from 50 to 286 days) in nutritive equilibrium. In many 

 experiments, such as Nos. 11, 14, 16, and 72, here reported, the 

 animals died rather suddenly, without any previous period of notable 



