CONTENTS OF VOL. IX. — FOURTH SERIES. V 



Page 



Dr. Heddle and Mr. R. P. Greg on British Pectolites 248 



Prof. Faraday's Magnetic Remarks 253 



Mr. A. H. Church on the Benzole Series. — Determination of 



Boiling-points 256 



The Rev. Prof. Callan on a New Single Fluid Galvanic Battery, 

 more powerful, and less expensive in construction and use, 



than any of the Nitric Acid Batteries 260 



The Rev. S. Haughton's Notes on Mineralogy. — No. I. On the 

 Chemical Composition and Optical Properties of the Mica of 



the Dublin, Wicklow, and Carlow Granites 272 



M. Melloni on a new Electroscope 276 



Sir W. R. Hamilton on some Extensions of Quaternions {con- 

 tinued) 280 



Prof. W. Thomson's Observations on the " Magnetic Medium," 



and on the Effects of Compression 290 



Proceedings of the Royal Society 293 



Royal Institution 309 



On the Artificial Production of Minerals belonging to the family 

 of Silicates and Aluminates by the Reaction of Vapours upon 



Rocks, by M. Daubree 315 



Meteorological Observations for February 1855 319 



Table " 320 



NUMBER LX.— MAY. 



Prof. Potter on the Interference of Light near a Caustic, and the 



Phaenomena of the Rainbow 321 



M. A. J. Angstrom's Optical Researches. (With a Plate.). ... 327 



Mr. J. Bridge on the Oblique Aberration of Lenses 342 



Mr. T. S. Hunt's Examinations of some Felspathic Rocks. . . . 354 



Mr. J. Ball on a doubtful point in Climatology 363 



Dr. Herapath's Further Researches into the Properties of the 

 Sulphate of Iodo-quinine or Herapathite, more especially in 

 regard to its Crystallography, with additional facts concern- 

 ing its Optical relations. (With a Plate.) 366 



Prof. Challis on the Theory of the Moon's Motion. — Results of 



a Third Approximation 370 



Mr. T. S. Hunt on the Mineral Wilsonite 382 



Proceedings of the Royal Society , . . 383 



On Sensitive Collodion, by Thomas Woods, M.D 398 



Meteorological Observations for March 1855 399 



Table 400 



NUMBER LXI.— JUNE. 



M. P. Riess on the Action of Non-conducting Bodies in Electric 

 Induction 401 



