CONTENTS 

 Original Papers 



Pago 

 Physics. — The resonance and ionization potentials for electrons in sodium 

 vapor. John T. Tate and Paul D. Foote 517 



Physics. — The photoelectric sensitivity of various substances. W. W. 

 Coblentz and W. B. Emerson 525 



Genetics. — The average correlation within subgroups of a population. 

 Sewell Wright 532 



Genetics. — A new case of metaphanic variation in grasses and its signifi- 

 cance. J. Dufrenoy 535 



Ornithology. — Diagnosis of a new pycnonotine family of Passeriformes. 



Harry C. Oberhoi.ser 537 



- Abstracts 



Radiation 542 



Physiological Optics 542 



Proceedings 



The Philosophical Society 543 



Announcement of program of the Anthropological Society 544 



