CONTENTS 



Original Papers 



PA6E 



Applied Mathematics. — A criterion for best magnitudes in precise measure- 

 ment. Mayo Dyer Hersey 187 



Radio-telegraphy. — Notes from the U. S. Naval wireless telegraphic labor- 

 atory. L. W. Austin 190 



Electricity. — Methods for the measurement of the effective inductance of 

 resistance coils. F. W. Grover and H. L. Curtis 194 



Organic Chemistry. — A new bromine method for the determination of 

 aromatic phenols. Atherton Seidell 196 



Marine Engineering. — -Thrust balancing in direct-connected, marine steam 



turbines. E. Buckingham 198 



Abstracts 



Astronomy 203 



Terrestrial Magnetism 206 



Biological Chemistry 208 



Pharmacology 209 



Geology 209 



Programs and Announcements 

 Philosophical Society 210 



