424 



INDEX. 



PAGE 



Vegetable coloring matters, nature ol, 2r>4 

 Ventilation and health, 368 



Vessels, iron, new method of clean- 

 ing, 22 

 Vitalism, 249 

 Volcano of Pichiucha, exploration 



of, 310 



Volcanoes, conical form of, 312 



Volcanic action in California, 286 



" cones and craters, 312 



Vulcan, LeVerrier's new planet, 382 



Wall-laying machine, 92 



Washing-machine, atmospheric, 84 



War implements, new, 49 



Water, determination of the presence 



of organic matter in, 253 



" from the bottoms of lakes, 



how procured, 174 



" hot, action of, on different 



substances, 221 



" motion of, when disturbed 



by a vessel, 19 



purification of, 58 



Water-glass aud its uses, 266 



Waves, destructive effects of, 



on the surluce of mercury, 

 Wave-line theory, 

 Weaving, by electro-magnetism, 

 Whales, capture of, by means of 



poison, 

 Wheels, car, the manufacture and 



delects of, 



Whiffle-tree, improved, 

 White Mountains, geology of, 

 Whit worth gun, The, 

 Wisconsin, Devonian rocks in, 

 Wood, artificial, 

 WOOD'S fusible alloy, 

 Workmen, mechanical, instruction 



of, 

 Writing-machine, Francis', 



Yeast, preservation of, 

 Yellow, Steinbuhl, 



PAGE 

 172 

 171 

 19 

 113 



90 



32 



94 

 278 



49 

 304 



63 

 205 



99 



70 



224 

 215 



Zeiodolite. a new mineral paste, 97 



Zinc-melting, by means of gas, 208 



Zinc, useful application of the am- 216 

 monio-chloride, 



'*-%, 







