I9I2] Lafayette B. Mendel i39 



rats with dietaries containing various Single purified proteins. But 

 not all proteins suffice to promote growth under otherwise favorable 

 conditions. Some suffice for maintenance without growth, whereby 

 a prolonged period of stunting, or suppression of growth, can be in- 

 duced ; still other proteins are alone insufficient for the maintenance 

 requirement. 



The capacity to grow is not lost even after comparatively long 

 periods of dwarfing and a subsequent normal unimpaired rate of 

 growth may be attained with a suitable protein dietary. Aside 

 from the apparent nutritive inequalities of the different proteins, 

 other incidental findings, such as the synthetic features in growth, 

 and diverse questions raised thereby, present a multitude of view- 

 points which may serve to direct further research in this field. 



Direct calorimetry of infants, with a comparison of the results 

 obtained by this and other methods 



JOHN HOWLAND 



A discussion of the various methods for determining the ex- 

 change of energy in infants with their advantages and disadvantages 

 and their limitations. The results of direct calorimetry obtained 

 with four children by means of a modified Atwater-Rosa-Benedict 

 calorimeter. The carbon dioxide excretion, oxygen consumption 

 and heat production of two essentially normal children. The effect 

 of the Ingestion of food, and especially of an excess of protein. The 

 effect of eighteen hours' fasting. The heat production and respira- 

 tory exchange of two extremely emaciated children. 



Difficulty of comparing results with those obtained by other 

 methods on account of the different conditions under which the 

 experiments have been conducted, the different Information that has 

 been supplied and also on account of the unsatis facto ry formulas for 

 determining the surface areas of infants, which give errors of 20 

 per Cent, and more. A new, more accurate and simple formula for 

 determining this. 



