CONTENTS 



Original Papers 



Page 

 Chemistry. — The nitrogen problem in relation to the war. Arthur A. 



Notes 381 



Ornithology. — Diagnosis of a new genus of Timaliidae. Harry C. Ober- 



HOLSER 394 



Technology. — Variance of measuring instruments and its relation to accuracy 



and sensitivity. Frederick J. Schlink 395 



Abstracts 



Geodesy 405 



Spectroscopy 405 



Metallography 406 



Ornithology 407 



Proceedings 



Geological Society 410 



Biological Society 413 



Scientific Notes and News 416 



