IV CONTENTS OF VOL. XXXIII. FOURTH SERIES. 



Dr. W.J. M. Rankine on the Phrase " Potential Energy," and 

 on the Definitions of Physical Quantities 88 



Prof. Tyndall on Sounding and Sensitive Flames 92 



Mr. G. F. Rodwell on some Effects produced by a Fluid in 

 Motion.— No. III. (With a Plate.) 99 



The Rev. S. Haughton on the Wave-lengths of the Transmis- 

 sion of Muscular and Nervous Action 118 



Mr. J. Croll on the Excentricity of the Earth's Orbit, and its 

 Physical Relations to the Glacial Epoch 119 



Mr. D. Forbes's R-esearches on the Mineralogy of South Ame- 

 rica 131 



M. P. Schiitzenberger on the Substitution of the Metal in a Salt 

 by Electro-negative Elements 140 



Archdeacon Pratt's Comparison of the Anglo- Gallic, Russian, 

 and Indian Arcs, with a view to deduce from them the Mean 

 Figure of the Earth 145 



Proceedings of the Geological Society : — 



Prof. Huxley on a new specimen of Telerpeton Elginense . . 152 

 Mr. S.V.Wood on a section at Litcham affording evidence 

 of Land-glaciation during the earlier part of the Glacial 



period in England 153 



Mr. F. W. Harmer on the evidence of a third Boulder-clay 

 in Norfolk 153 



Experimental Demonstration of the Elongation of a Conductor 

 traversed by a Current, independently of Elongation by Heat, 

 by E. Edlund 154 



On the Meteoric Shower of 1866, November 13-14, by Sir J. 

 F. W. Herschel, Bart 156 



Inference from the observed movement of the Meteors in the ap- 

 pearance of 1866, November 13-14, by G. B. Airy, Esq., 

 Astronomer Royal 157 



On an arrangement for the Graphical Representation of Curves 

 of Vibration by means of Mechanism, by Ernst Mach .... 159 



NUMBER CCXXII.— MARCH. 



Mr. W. R. Grove on Aplanatic Telescopes 161 



Mr. D. D. Heath on the Dynamical Theory of Deep-sea Tides, 



and the Effect of Tidal Friction 1 65 



Dr. Atkinson's Chemical Notices from Foreign Journals .... 187 

 Mr. C. Brooke on Negative Fluid Pressure on a given Surface. 207 

 Prof. Hennessy on the Physical Properties of Water in relation 



to Terrestrial Climate 211 



Mr. J. Croll on the Reason why the Difference of reading be- 

 tween a Thermometer exposed to direct Sunshine and one 



Shaded Diminishes as we ascend in the Atmosphere 213 



Mr. W. F. Barrett on " Sensitive Flames " 216 



