CONTENTS, 
I. Supplement to a Paper “ On the Theoretical Explanation of an apparent new 
Polarity in Light." By G. B. Airy, Esq. M.A. F.R.S. , Astronomer 
Royal page I 
II. Contributions to Terrestrial Magnetism. — No. II. By Lieut. -Colonel Edward 
Sabine, R.A. V.P.R.S 11 
III. On Gh'ound Gru, or Ice formed , under peculiar circumstances, at the bottom of 
Running IVater. By James Farquharson, LL.D. F.R.S. , Minister of the 
Parish of Alford 37 
IV. On a Remarkable Property of the Diamond. By Sir David Brewster, K.H. 
D.C.L. F.R.S. and V.P.R.S. Ed 41 
V. On the Phenomena of Thin Plates of Solid and Fluid Substances exposed to 
Polarized Light. By Sir David Brewster, K.H. D.C.L. F.R.S. and 
V.P.R.S. Ed 43 
VI. Memoir of the Case of a Gentleman born blind, and successfully operated upon 
in the 1 8th year of his age, with Physiological Observations and Experiments. 
By J. C. August Franz, of Leipzic, M.D., M.R.C.S., 8fc. Communicated by 
Sir Benjamin C. Brodie, Bart., F.R.S., fyc 59 
VII. Additional Note on the Contraction of Voluntary Muscle in the Living Body. 
By William Bowman, Esq., F.R.S., Demonstrator of Anatomy in King's 
College, London, and Assistant Surgeon to the King's College Hospital . 69 
VIII. Note on an inequality in the Height of the Barometer, of which the Argument 
is the Declination of the Moon. By Sir J. W. Lubbock, Bart., Treas. and 
V.P.R.S 73 
IX. On the Calculation of Attractions, and the Figure of the Earth. By C. J. 
Hargreave, B.A. of University College, London. Communicated by John T. 
Graves, Esq., A.M. F.R.S., of the Inner Temple 75 
