CONTENTS 



Original Papers 



Page 



Chemistry. — Determining soil acidity and alkalinity by indicators in the field. 

 E. T. Wherry 217 



Radiotelegraphy. — Musical reception with continuous waves without local 



oscillations. L. W. Austin 223 



Meteorology. — The use of solar radiation measurements for weather fore- 

 casting in Argentina. C. G. Abbot 226 



Proceedings 



Washington Academy of Sciences 236 



Scientific Notes and News 243 



