462 



same animal tested at different times, the limit of assimilation for a dog 

 weighing from 2.5 to 3.6 kilograms (5.5 to 7.0 pounds) was for cane 

 sugar about 10 grams; dextrose, 5 grams; milk sugar, one half gram; 

 galactose, one half gram. The limit was nearly the same with the same 

 animal and the same sugar at different times. 



Galactose and milk sugar passed into the urine much more readily 

 than dextrose, laevulose, or cane sugar. 



Influence of the addition of protein to a maintenance ration on the metabo- 

 lism in full-grown animals. Prepared by W. Henneberg and Th. Pfeiffer, on 

 the basis of investigations by E. Kern and H. Wattenberg {Journ, f. 

 Landiv., 38 (1890), pp. 215-279).— The experiment was made with two 

 full-grown sheep and extended over 7 periods of 3 weeks each. The 

 maintenance ration consisted during the whole experiment of 800 grams 

 of hay and 200 grams of barley meal per animal daily. This ration 

 was fed alone during periods 1 and 7. There were added to this ration 

 during periods 2, 3, and 4, respectively, 70, 140, and 210 grams of 

 conglutin from lupine ; and during periods 5 and 6, respectively, 152 

 and 70 grams of ground meat from which the fat had been thoroughly 

 extracted. The liquid and solid excrement was collected during the 

 last 2 weeks of each period, and for 2 days during this time the pro- 

 duction of carbonic acid per 24 hours was determined by means of a 

 respiration apparatus. While the results are not considered by the 

 authors as altogether conclusive, they in part corroborate previous 

 observations, and are highly instructive. The following brief sum- 

 mary gives the quantities of nutrients digested, and the quantities of 

 protein and fat stored in or lost from the body. 

 Average results per sheep daUij. 



The proportion in which the nutrients replace one another in serving 

 as fuel in the body is believed to correspond with their potential 

 energy. The authors use the averages given by Rubner,* according 



•Zeitsch. f. Biologie, 19, p. 313. 



