V 



April 26, 1877. 



Page 



On the Nature and Origin of the Beds of Chert in the Upper Carboniferous 

 Limestones of Ireland. By Prof. Edward Hull, M.A., F.R.S., Director 

 of the Geological Survey of Ireland. With Chemical Notes, by E. T. 

 Hardnian, F.C.S., of the Geological Survey of Ireland 163 



Researches on Emeralds and Beryls. — Part II. On some of the Processes 

 employed in the Analysis of Emeralds and Beryls. By Greville Williams, 

 F.R.S 165 



On Repulsion resulting from Radiation. — Preliminary Note on the Otheo- 

 scope. By William Crookes, F.R.S. &c 176 



On the Inferences to be drawn from the Appearance of Bright Lines in the 

 Spectra of Irresolvable Nebulae. By William Huggins, D.C.L., LL.D., 

 F.R.S 179 



List of Presents 181 



On the Temperature of the Human Body in Health. By Sydney Ringer, 

 M.D., Professor of Therapeutics at University College, London, and the 

 late Andrew P. Stuart, M.R.C.S 186 



No. 181.— May 3, 1877. 



Further Observations on the Modification of the Excitability of Motor 

 Nerves produced by Injury. By George J. Romanes, M.A., F.L.S 211 



On the Temperature-correction and Induction-coefficients of Magnets. By 

 G. M. W r hipple, B.Sc, Superintendent of Kew Observatory 218 



Distribution of the Radicals of Electrolytes upon an Insulated Metallic 

 Conductor. By Alfred Tribe, Lecturer on Chemistry in Dulwich 

 College 222 



May 17, 1877. 



On Hyper] acobian Surfaces and Curves. By William Spottiswoode, M.A., 

 Treas. R.S 226 



On the Length of the Spark from a Voltaic Battery in different Gases at 

 ordinary Atmospheric Pressures. By Warren De la Rue, M.A., D.C.L., 

 F.R.S., and Hugo W. Muller, Ph.D., F.R.S 227 



Further Researches on the Deportment and Vital Resistance of Putrefactive 

 and Infective Organisms, from a Physical point of view. By John Tyn- 

 dall, LL.D., F.R.S., Professor of Natural Philosophy in the Royal Insti- 

 tution 228 



May 31, 1877. 



The Physical Properties of Homologues and Isomers. By Frederick D. 

 Brown, B.Sc 238 



On the Amplitude of Sound-waves. By Lord Rayleigh, M.A., F.R.S 248 



