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CONTENTS 



Original Papers 



Page 

 Physics. — Some notes on the theory of the Rayleigh- Zeiss interferometer. 



Leason H. Adams ., ' 265 



Physical Chemistry. — A yacuiim furnace for the measui-ement of small disso- 

 ciation pressures. R. B. Sosman and J. C. Hostetteh 277 



Botany. — Spring flowers in the fall. J. B. Norton 285 



Botapy. — Tribroma, a new genus of tropical trees related to Theobroma. 

 6. F. Cook 287 



Proceedings 

 The Biological Society 290 



