CONTENTS 



OHiaiNAii Papers 



Physics. — Length standards and measurements. Louis A. Fischer 145 



Geology. — Some features of the ore deposits of Gilpin County, Colorado. 



Edson S. Bastin and J. M. Hill 160 



Botany. — A new genus, Fortunella, comprising four species of kumquat 



oranges. Waltbb T; Swingle 165 



AbriTRACTS 



Meteorology 177 



Chemistry 177 



Physical Chemistry 178 



Mineralogy 179 



Petrology 180 



Geology 181 



Proceedings 



The Washington Academy of Sciences 183 



The Geological Society 185 



The Botanical Society 187 



