CONTENTS 



Original Papers 



PAGE 



Physics. — Melting temperatures of sodium and lithium metasilicates. F. M. 



Jaeger 49 



A method for determining the density of certain solids by means of Rohr- 



bach's solution having a standard refractive index. H. E. Merwin 52 



Electricity. — A study of the current transformer with particular reference to 



iron loss. P. G. Agnew 53 



Geochemistry. — Minerals and rocks of the composition MgSi0 3 -CaSi0 3 - 



PeSi0 3 . Robert B. Sosman 54 



Mineralogy. — Crystallized turquoise from Virginia. Waldemar T. Schaller 58 



Quartz and fluorite as standards of density and refractive index. H. E. 



Merwin 59 



The temperature stability ranges, density, chemical composition and 



optical and crystallographic properties of the alkali feldspars. H. E. 



Merwin 59 



Petrology. — A micrometer ocular with coordinate scale. Fred Eugene Wright (iO 



The lavas of Hawaii and their relations. Whitman Cross 61 



Paleontology. — Remarks on the fossil turtles accredited to the Judith River 



formation. F. H. Knowlton' 64 



Zoology. — Remarks on the nervous system and symmetry of the crinoids. 



Austin H. Clark 65 



Chemical statistics. — The consumption of the commoner acids in the United 



States. Charles E. Munroe 70 



Abstracts 



Geodesy 74 



Meteorology 77 



Terrestrial Magnetism 80 



Electricity 80 



Radio-telegraphy 82 



Chemistry 84 



Electrochemistry 85 



Agricultural Chemistry 86 



Mineralogy 88 



Geology 89 



Botany 91 



Forestry 92 



Zoology ' -94 



Conchology 95 



Fisheries 96 



Pharmacology 97 



Bacteriology 99 



Sanitation 99 



Engineering 100 



Proceedings 



Washington Academy of Sciences :.... 101 



