marked increase in variability of body weight 

 both for inbred and stock rats. 



Sex ratio in the albino rat. — By selection 

 the inbred strain has been separated into two 

 lines, one with a high, the other with a low, 

 sex ratio; but the ejfect of selection seems to 

 be limited. The two strains are alike in body 

 weight, growth curve and variability of body 

 weight. 



It will be noticed that each of the one or 

 more paragraphs of each abstract begins with 

 an italicized paragraph title. In some cases 

 words or phrases within a paragraph are also 

 italicized. This is not done for emphasis but 

 to associate them with the paragraph titles 

 which they supplement and complete. Para- 

 graph titles and italicized words and phrases 

 will collectively be called subtitles. If the 

 reader will run through the sample abstracts, 

 skipping all but these italicized subtitles, he 

 will get in each case a descriptive index of 

 the information in the article. For example: 



ABSTRACT NO. 1 



Atomic weight of iodine. 



Pentoxide method. 



Determinations. 

 Iodine pentoxide. 



Preparation, purification. 



Decomposition with heat. 

 Preparation of pure iodine. 

 Occlusion of oxygen by glass, porcelain and 



copper. 



ABSTRACT NO. 3 



Helium atom models. 



(1) Bohr's model. 



(2) Double circle model. 



(3) Semi-circular model. 

 Application of the quantum theory to- 

 coupled electrons; suggestion. 



The subtitles, then, form in each case an 

 index of the abstract. By glancing through 



