VI CONTENTS. 



Page 

 Prof. B. Powell on the Achromatism of the Eye : in reply to 

 some Remarks in the Lond. and Edinb. Phil. Mag. and 



Journal of Science, No. 33 247 



Mr. J. Nixon on the Trigonometrical Height of Ingleborough 



above the Level of the Sea. Part 1 248 



Rev. Baden Powell's Abstract of the essential Principles of 

 M. Cauchy's View of the Undulatory Theory, leading to an 

 Explanation of the Dispersion of Light ; with Remarks 



{concluded) 262 



Rev. J. Challis on the i\.nalytical Determination of the Laws 



of transmitted Motion 267 



Dr. Faraday's Experimental Researches in Electricity. — 



Eighth Series {continued.) 272 



Mr. J. O. Westwood. Insectorum novorum exoticorum (ex 



Ordine Dipterorum) Descriptiones 280 



Mr. D. Griffin on an unusual Affection of the Eye, in which 



three Images were produced 281 



Prof. J. D. Forbes on the Refraction and Polarization of Heat 



(co7itinued.) 284 



Mr. A.Trevelyan's Description of a new Spirit-lamp Furnace 292 

 New Books : — The West of England Journal of Science and 

 Literature — Mr. Pritchard's List of two Thousand Micro- 

 scopic Objects, &c 293 



Proceedings of the Royal Society 297 



Astronomical Society 305 



Zoological Society 307 



Geological Society 312 



Preparation of Cantharidine 318 



Gallic Acid speedily prepared — Preservation of Deliquescent 



Salts — Composition of the Atmosphere 319 



Meteorological Observations 320 



NUMBER XXXV.— MAY. 



Dr. Daubeny on Dr. Ure*s Paper, in the Philosophical Trans- 

 actions, on the Moira Brine Spring; and on the Proportion 

 of Bromine in the Waters of different Seas 321 



Mr. D. Mushet on the Fusion and Appearance of refined and 

 unrefined Copper 324 



Prof. T. Graham on Water as a Constituent of Salts. In the 

 Case of Sulphates 327 



Dr. Faraday's Experimental Researches in Electricity. — 

 Eighth Series {continued) 334 



Prof. J. R. Young on the Summation of slowly converging and 

 diverging Infinite Series 348 



Dr. W. C. Henry's Experiments on the Action of Metals in 

 determining Gaseous Combination 354 



