VI CONTENTS OP VOL. XXXVIII. FOURTH SERIES. 



Page 

 on the Hypothesis of Undulations with Ditscheiner's determi- 

 nations of Wave-lengths and corresponding refractive Indices 268 

 Prof. E. C. Pickering's Observations of the Corona during the 



Total Eclipse, August 7th, 1869 281 



Dr. H. Herwig's Investigations on the Conformity of Vapours 

 to Mariotte and Gay-Lussac's Law. (With a Plate.) .... 284 



Mr. J. S. Aldis on the Nebular Hypothesis 308 



M. P. A. Favre's Thermal Researches on the Battery 310 



Proceedings of the Royal Society : — 



The Earl of Rosse on the Radiation of Heat from the Moon. 314 

 Proceedings of the Geological Society : — 



Mr. E. Hull on the Evidence of a ridge of Lower Carboni- 

 ferous Rocks crossing the Plain of Cheshire beneath the 



Trias 321 



The Rev. T. Wiltshire on the Red Chalk of Hunstanton . . 321 



On the Expansion of Gases, by M. A. Cazin 322 



On the Employment of the Spectroscope in order to distinguish 



a feeble Light in a stronger one, by M. J. M. Seguin .... 325 

 On the Mean Velocity of the Motion of Translation of the Mo- 

 lecules in Imperfect Gases, by M. P. Blaserna 326 



NUMBER CCLVI.— NOVEMBER. 



Dr. Marcet's Observations on the Temperature of the Human 

 Body at various Altitudes, in connexion with the act of As- 

 cending 329 



Lieut. J. Herschel on that portion of the Report of the Astro- 

 nomer to the Madras Government on the Eclipse of August 



1868 which recounts his Spectroscopic Observations 338 



MM. C. Borgen and R. Copeland's Short Account of the Win- 

 terings in the Arctic Regions during the last fifty years .... 340 

 M. F. Zollner on a New Spectroscope, together with contribu- 

 tions to the Spectral Analysis of the Stars 360 



Mr. R. Moon on the Structure of the Human Ear, and on the 

 Mode in which it administers to the Perception of Sound . . 369 



Mr. W. K. Bridgman's Theory of the Voltaic Pile 377 



Proceedings of the Royal Society : — 



Prof. A. W. Church on Turacine '. 383 



Mr. W. Crookes on a New Arrangement of Binocular Spec- 

 trum-Microscope 383 



Mr. W. Crookes on some Optical Phenomena of Opals . . 388 

 Sir W. Thomson on a new Astronomical Clock, and a Pen- 

 dulum-governor for Uniform Motion 393 



Dr. W. A. Miller on a Self-registering Thermometer adapted 



to Deep-sea Soundings , . 395 



Proceedings of the Geological Society : — 



Mr. W. B. Dawkins on the British Postglacial Mammalia. 399 



