INDEX. 



411 



Waterston (J. J.), proof of a sensible 

 difference between the mercurial and 

 air thermometers, from 0° to 100° C, 

 225. 



Water, supply of, from chalk stratum; 

 25 ; average of percolation ; movement 

 of,in neighbourhood of London; means 

 of draining otf, 26. 



Waves, theory of, 231 ; positive and ne- 

 gative phenomena of same class ; hori- 

 zontal motion of oscillating, 232. 



Welsh (J.), report on the general pro- 

 cess adopted in graduating and com- 

 paring the standard meteorological 

 instruments for the Kew Observatory, 

 178. 



— — on the graduation of the ther- 

 mometers for the Arctic searching ex- 

 pedition, 183. 



, account of meteorological observa- 

 tions in four balloon ascents, 309. 



Wheatstone (C), note relating to Fou- 



cault's new mechanical proof of the 



rotation of the earth, 65. 

 Wheatstone (C), contributions to the 



physiology of vision, Pt. II., 138. 

 Williams (Thos.) on the blood-proper 



and chylo-aqueous fluids of invertebrate 



animals, 163. 

 Wind, relation and direction of, to moon's 



age, 34. 



, rain produced by currents of, 41. 



, charts of direction of, 190 ; ocean 



routes shortened by knowledge of, 191. 

 Wines, acidity, sweetness, and strength 



of, 378. 



Wrottesley (Lord) *on the results of 

 periodical observations of the positions 

 and distances of 19 of the stars in 

 Sir J. Herschel's list, &c., 13. 



Younghusband (Capt.) on periodical 

 laws in the larger magnetic disturb- 

 ances, 287. 



END OF THE SIXTH VOLUME. 



PRINTED BY TAYLOR AND FRANCIS, 

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