2O 



CHESTER A. STEWART. 



the experiment they were killed and autopsied according to the 

 method used by Jackson ('15), with a few modifications. 



TABLE I. 



RECORD OF LITTERS USED. 



For economy of space, only the average data are indicated in 

 most cases in this paper. A copy of the cards containing the 

 individual data will be filed in the Wistar Institute of Anatomy 

 (Philadelphia) however, where they will be accessible to anyone 

 interested. 



On account of the relatively small number of observations, and 

 the known variability of the various organs, the data are incon- 

 clusive in some cases. They are, however, sufficient to show 

 clearly some of the more obvious and important changes in the 

 rats refed after various periods of maintenance. 



An abstract of the present paper has been published in the 



1 W = litters from Wistar stock; the others are from Minnesota stock. 

 - Controls in litters St 10 and St 12 killed at 16 weeks of age. 



