358 



Mary Davies Swartz, 



tatively after subcutaneous injection in man and the rabbit; or as 

 Mendel and Mitchell, ^ who have shown that polysaccharides like 

 dextrin, soluble starch, glycogen, inulin, and isolichenin are recovered 

 to a considerable extent in the urine, whether introduced subcuta- 

 neously, intraperitoneally, or intravenously. 



In the present experiments, the dulse pentosan was the most slowly 

 eliminated, being found in the urine four or five days after injection; 

 Irish moss and salep were not detected after the third day; while si- 

 nistrin seemed to be all excreted within the first 24 hours. 



The average coefficients of digestibility for the ten preparations 

 which have formed the basis of the feeding experiments, are summar- 

 ized in the following table : 



Coefficients of Digestibility of Hemicelluloses. 



HEiaCELLULOSE. 



SUBJECT OF EXPERIMENT. 



Class. 



Source. 



Dog. 



Man. 



Pentosan 

 Pentosan 

 Pentosan 

 Pentosan 

 Galactan 

 Galactan 

 Galactan 

 Galactan 

 Mannan . 



Dulse 



Limu Eleele 

 Limu Pahapaha 

 Limu Lipoa 

 Irish Moss 

 Limu Manauea 

 Limu Huna 

 Limu Akiaki 

 Salep Powder 

 Salep Mannan 



Per cent. 



73 (2 exp.) 

 35 (2 exp.) 



16 (1 exp.) 

 33 (2 exp.) 

 33 (2 exp.) 

 56 (2 exp.) 



85 (2 exp.) 

 10 (1 exp.) 



Per cent. 

 100 (2 exp.) 

 9 (2 exp.) 

 34 (1 exp.) 



6 (2 exp.) 

 30 (3 exp.) 

 10 (1 exp.) 

 60(1 exp.)* 

 97 (2 e.xp.) 

 100 (2 exp.) 



* Subject with chronic constipation. 



That the low coefficients enumerated above are not due to inabil- 

 ity of the various subjects to utilize carbohydrates, is shown by the 

 following figures. 



The coefficient of digestibility for cracker meal in the experiments 

 on dogs, determined by taking the average of all the fore-periods of 

 the feeding trials, in which five ditiferent dogs were used, was 99.0 

 per cent. This is much higher than London and Polowzowa's= coef- 

 ficient for carbohydrate digestibility in dogs on a bread diet, 96 per 

 cent. 



1 American Journal of Physiology, v. 14, p. 239 (1905). 

 - Zeitschrift fiir physiologische Chemie, 56, 513 (1908). 



