CONTENTS 



Okiqinal Paprrs 



Pm« 



Physics. — Characteristic equations of tungsten filament lamps and their ap- 

 plication in heterochromatic photometry. G. W. Middlekauff and 



J. E. Skogland 61 



Physics. — The temperature coefficient of magnetic permeability within the 



working range. Raymond L. SANFom> 63 



Geochemistry. — Experiments with colloidal gold and silver. Edson S. Bastin 64 



Botany. — The application of the generic name Achyranthes. Paul C. 



Standley 72 



Zoology. — The bathymetrical distribution of the Arctic and Antarctic cri- 



noids. Austin H. Clark 76 



Abstracts 



Geodesy 83 



Physics 84 



Physical Chemistry 88 



Chemistry 91 



Mineralogy 92 



Petrology 96 



Botany 97 



Forestry 98 



Zoology. 99 



Bacteriology 100 



