CONTENTS. 
V 
NOTICES AND ABSTRACTS 
OF 
MISCELLANEOUS COMMUNICATIONS TO TIIE SECTIONS. 
MATHEMATICS AND PHYSICS. 
Mathematics. 
Pur 
Mr. Arthur Cayley on the Solution of Cubic and Biquadratic Equation* ... 1 
Sir W. R. Hamilton on an Extension of Quaternions .. 1 
Light, Heat, Electricity, Magnetism. 
M. Babinet on a New Photometer ... . 
Dr. F£lix Bernard’s Note on Indices of the Refraction of Transparent Media 
included between two Parallel Faces, and on a Portable Refractomcter. exhi¬ 
bited to the British Association for the Advancement of Science . 
--Description of a Photometer exhibited to the British 
Association for the Advancement of Science . 
- —■ Note on Polarimetry.... 
Mr. John W. Brett on the Origin of the Submarine Telegraph and it* Ex¬ 
tension to India and America .... * 
Mr. Edward B. Bright on Magneto-Electricity and Underground Wires ... S 
M. Dove on an Apparatus for eUiptieally-polnrized Light . '* 
-on some Stereoscopic Phenomena . 
-on a Method of measuring the Absorption of Polarized Light in 
doubly refracting Crystal*. 1" 
Rev. J. B. Reade on Photographs of the Moon and of the Sun. h* 
Sir John Ross on Errors which maybe occasioned by disregarding the In¬ 
fluence of Solar or Artificial Light on Magnets . ' - 
- on the Deviation of the Magnetic Needle peculiar to Livcqwol 1- 
Rev. Dr. Scoresby on Pictorial and Photochromatic Impression* on the Re¬ 
tina of the Human Eye..... I- 
Mr. Archibald Smith on a Graphic Method of Correcting the Deviation* <>f 
a Ship’s Compass . ‘ ’ 
