INDEX. 523 



Page. 



Wartinann, Elie, memoir of, on color-blindness 233, 239 



Water surface favorable to the transmission of sound 400 



Watkins, Mr., application by, of a spiral conductor in hydro- 

 electricity 108 



"Watt, James, both a discoverer and an inventor 820 



Webb, Captain, witness of abnormal phenomena of sound 415, 421 



Welling, Dr. James C, co-operation of, in observations on sound 453,460, 



465 



Whaley, Mr. Joseph, observations by, on the aerial echoes 504 



Whitehead Light-station, observations at, on sound 426, 490 



Wilcox, hot-air engine, experiments with, for fog-trumpets 386 



Wind at upper regions observed by toy balloons of rubber 441, 442 



Wind, etfect of, on range of sound 418, 419, 464, 467, 475 



Wind, etiect of reversed uppiT and lower currents on sound 423 



AVind stronger in upper regions than near the surface of the earth- 390 



Wind when adverse causing sound to rise 388 



Wire helix, vivid spark from 87 



Wires of unequal diameter, effect of self-induction on 94 



Wire on armature of magneto-electrical machine, effect of 117 



Wire, the length of, in relation to size of battery plates 113 



Woodruff, Gen'l I. C, co-operation of, in observations on sound.- 434,437, 



453, 461, 465,473 

 Woodruff, Mr. Edward L., co-operation of, in observations on sound 453, 487 



Yale College, electro-magnet made for 50 



Young, Dr. Thomas, plan by, of a simple heliostat 192 



Young, Dr. Thomas, theory by, of liquid cohesion and capillarity. 218 



