VI CONTENTS. 



Page 



Account of the new Observatory for Magnetic Observations at 



Gottingen 344 



Mr. Faraday on the Magneto-electric Spark and Shock, and 

 on a peculiar Condition of Electric and Magneto-electric 



Induction 349 



Mr. J. Thomson on the Mummy Cloth of Egypt ; with Obser- 

 vations on some Manufactures of the Ancients 355 



Mr. C. Blackburn on a Method of determining the Number of 



Signals which can be made by the Modern Telegraphs .... 365 

 Dr. L. Agassiz's Observations on the Growth and on the bila- 

 teral Symmetry of Echinodermata 369 



Mr. R. Addams's Account of a peculiar Optical Phenomenon 



seen after having looked at a moving Body, &c 373 



K.'s Account of some curious Facts respecting Vision 375 



Mr. Sturgeon's Account of some Magneto-electrical Experi- 

 ments made with the large Magnet at the Exhibition Room, 



at Adelaide-street 376 



Prof. R. Hare's Apparatus for Freezing Water by the Aid of 



Sulphuric Acid 377 



Proceedings of the Zoological Society 379 



British Association for the Advancement 



of Science , 386 



Oxide of Carbon free from Carbonic Acid 391 



Analysis of the Brain 392 



Valerianic Acid and its Salts 396 



Hydrocyanic iEther — Distillation of Tartaric and Pyrotartaric 



Acids , 397 



Mr. G. O. Rees on the Existence of Titanium in Organic 



Matter 398 



Crystallization of Kalium or Potassium — Scientific Books. . . . 399 

 Meteorological Observations 400 



NUMBER XXX.— DECEMBER. 



Prof. Graham on Phosphuretted Hydrogen 401 



Mr. D. Lyon's Observations on Magnetic Substances 415 



Mr. W. Sturgeon's Description of a Thunder-Storm as ob- 

 served at Woolwich; with some Observations relative to the 

 Cause of the Deflection of Electric Clouds by high Lands; 

 and an Account of the Phenomena exhibited by means of 



a Kite elevated during the Storm 418 



Mr. Faraday's Experimental Researches in Electricity. — Se- 

 venth Series (concluded) 424 



Mr. J. H. Wheeler's Experiments and Observations on the Ap- 

 plication of Photometry to certain Cases connected with the 

 Undulatory Theory of Light 439 



