Sugar and Oxygen Relationships in Blood of Dogs. 67 



milk. The total calcium intake and the per cent, of the intake 

 gained or lost are shown below : 



Average Daily Intake of Calcium and Per Cent, of Intake Retained or 



Lost. 



Subject. 



Diet. 



Intake Grams Ca. 



Per Cent. Calcium 

 from Carrots. 



Per Cent. 

 Gain or Loss. 



E. D. B 



"Milk" 



O.383 





+ 16 



R. S. E 



"Milk" 



O.383 





+ 23 



E. D. B 



"Carrot" 



0.315 



55 



+ 17 



R. S. E 



"Carrot" 



0.315 



55 



- 7 



E. H 



"Carrot" 



O.261 



84 



+ 4 



E. W 



"Carrot" 



O.297 



82 



+ 27 



40 (1500) 



Sugar and oxygen relationships in the blood of dogs. 

 By Ernest L. Scott and A. Baird Hastings. 



[From the Department of Physiology of Columbia University.] 



Before subjecting the organism to certain experimental con- 

 ditions capable of changing the sugar and oxygen relationships 

 of dog's blood, it was thought advisable to determine the variations 

 and relationships which might normally be encountered within 

 the same individual at different times and in different individuals. 



The blood sugar was estimated by the MacLean method. 

 The capacity of the blood for oxygen and its actual oxygen content 

 were determined by the Van Slyke technic. Specimens of blood 

 from the external jugular veins of resting dogs were drawn by 

 aspiration without exposure to the air, at intervals of one and 

 one half or two hours over periods of six, or seven and one half 

 hours. To date eleven such series of observations on eight dogs 

 have been completed. 



In view of the frequent statement in the literature that even a 

 slight amount of hemorrhage may induce hyperglycemia and 

 because loss of corpuscles would tend to reduce the oxygen- 

 carrying capacity of the blood, the effects of loss of blood on the 

 factors to be studied were examined. The total amount of blood 

 in the body was assumed to be five per cent, of the body weight. 

 Successive samples were drawn until about ten per cent, of the 



