406 



INDEX. 



PAGE 



Utah, boiling springs of, 301 



Valve motion, Perry's, 62 



" safety, new, 48 

 Vegetation, Arctic, protecting influence 



of snow on, 347 



effects of moonlight on, 345 



Ventilation, hints on, 219 



of mines, 124 



Vermilion, antimonial, 275 



Vessels, new mode of coppering, 246 



Violin bow, improved, 108 



Viviparity and oviparity, 358 



Volcanic cinders from the bottom of the 



Atlantic, 321 



Water, deposit obtained by evaporation 



of, 238 



" photographic images under, 204 



"Waves, action of, on sea-beaches, 216 



"Wax, vegetable, 279 



"Weathercock and chimney register, 124 



PAGE 



"Weaving double, 95 



"Weights and Measures, uniform system 



of, 10 



Wells, artesian, on the plains, . 325 



negative, 307 



"Wheat, microscopic discoveries in re- 

 gard to the nature of, 353 

 plant, origin of, 359 

 " produce and composition of, 352 

 Wheels, railway, 56 

 WHITEHOUSE, E. O., 143 

 WHITNEY, J. D., on the probable origin 



of inclined strata, 308 



Wind, to ascertain the direction of, 220 



Wood, and other hard substances, substi- 

 tutes for, 96 

 " occurrence of, in the Arctic 



regions, 298 



Yacht, Dempster's triangular, 

 Zinc, plastic, for rooms, 



41 

 99 



