INDEX. 



535 



Viscosity, investigation of, Barus, 87. 

 Voltaic arc, mercury, Avon, 159. 



w 



Wadsworth, M. B., subdivisions of Ar- 

 chaean in Northern Michigan, 72. 



Waggener, gelatine slides for lantern 

 projection, 78. 



Walcott, C. D., North American conti- 

 nent during the Cambrian, 163. 



"Ward, H. A., meteorite from Japan, 153. 



Weather, a short cycle in, Hall, 227. 



"Wells, H. L., cassium-lead and potas- 

 sium-lead halides, 121. 



West Indies, observations in, Agassiz, 

 78, 358. 



Wheeler, H. L., double halides of tellu- 

 rium with potassium, rubidium and 

 caesium, 267. 



White, D., a new tasniopterid fern and 

 its allies, 439. 



Whitney, A. W., refraction of light 

 upon the snow, 389. 



Williams, G-. H., geological map of 

 Baltimore, 73 ; rock-cutting and 

 grinding machine, 102. 



"Williamson, W. C, fossil plants of the 

 Coal measures, 437. 



Wilson, H. M\, Manual of Irrigation 

 Engineering, 442. 



Winchell, N. H., geol. survey of Minne- 

 sota, 1890, 78. 



Winslow, A., Cambrian in Missouri, 

 221 ; geol. survey of Missouri, 354. 



Woodward, A. S., Devonian fishes of 

 Canada, 73. 



Woodward, R. S., iced-bar base appara- 

 tus of the U. S. Coast and Geodetic 

 Survey, 33. 



"Wright, A. A., Nikitin on the Quater- 

 nary deposits of Russia, 459. 



Zahm, J. A., Sound and Music, 69. 



