CONTENTS . 



Original Papers 



Page 



Electricity. — A determination of the international ampere in absolute measure. 



E. B. Rosa, N. E. Dorsey and J. M. Miller 211 



Resistance coils for alternating current work. H. L. Curtis and F. W. 



Grover 219 



Physics. — Helium tubgs as light standards. P. G. Nutting 221 



Organic Chemistry. — Some new compounds of the choline type. G. A. 



Menge 223 



Chemistry of Foods. — Research work of the division of foods of the Bureau of 



Chemistry. H. W. Wiley 224 



Biochemistry. — The colorimetric and physiological estimation of the active 



principle of the suprarenal gland. Worth Hale and Atherton Seidell. . . . 225 

 Plant Physiology. — The wilting coefficient for different plants and its indirect 



determination. Lyman J. Briggs and H. L. Shantz 228 



Abstracts 



Meteorology 233 



Physics : ■ 234 



Physical Chemistry 234 



Chemistry 235 



Geology 235 



Economic Geology 238 



Petrology 239 



Biology 240 



Fisheries 241 



Plant Pathology 241 



Entomology 244 



Psychopathology 246 



Programs and Announcements 

 Philosophical Society 246 



