Blood Pressures in Girls during Adolescence. 247 



107 (1854) 



Spontaneous agglutinability of bacteria in relation to the 

 antagonistic action of certain cations. 



By RALPH R. MELLON. 



[From the Department of Laboratories, Highland Hospital, 

 Rochester, N. Y.] 



Spontaneous agglutinability of five separate, single-celled (pure 

 line) cultures of diphtheroid bacilli was shown to be a function 

 of growth-cycle developments. The bacillary phase, growing at 

 37°, was immediately and completely agglutinable by any solution 

 tried. The coccus phase, growing at 20 0 , formed stable emulsions 

 in NaCl and other salt solutions. By reversing the growth tem- 

 perature, even on the same media, the agglutinability and mor- 

 phology were reversed. Certain of the cultures, still completely 

 agglutinable by NaCl, formed stable emulsions in Tyrode's and 

 other equilibrated solutions. The mutual antagonism of the Na, 

 K and Ca ions is believed to explain the phenomenon. The Mg ion 

 was especially beneficial. With various cultures of different age 

 and environment, all possible variations in agglutinability were 

 observed. The amplification of these observations, now in prog- 

 ress, promises to explain some of the paradoxes of the bacterial 

 agglutination, and the observations in themselves constitute the 

 first systematic application of these principles to agglutination. 



108 (1855) 



Blood pressures and heart rate, in girls, during adolescence. 

 A preliminary study of 1,700 cases. 



By STANLEY ROSS BURLAGE (by invitation). 



[From the Department of Physiology, Cornell Medical College, 



Ithaca, N. Y.] 



The data were obtained from over 800 girls in the public 

 schools of Ithaca, N. Y., whose ages ranged from 9 to 16 years and 

 from about an equal number of young women in Cornell Univer- 

 sity, from 16 to 26 years old. 



