via CONTENTS OF VOL. XV. FOURTH SERIES. 



The Ilev. R. Carmichael on the Singular Solutions of Differen- 

 tial Equations t--^ 



Proceedings of the Royal Society: — 



Dr. Joule on the Thermal Effects of Longitudinal Com- 

 pression of Solids, and Prof.W. Thomson on the Altera- 

 tions of Temperature accompanying Changes of Pressure 



in Fluids -^38 



Dr. Brown-Sequard on the Influence of Efforts of Inspi- 

 ration on the Movements of the Heart. ^-i'-^ 



Dr. Brown- S^quard on the Influence of Oxygen on the 

 vital properties of the Spinal Cord, Nerves, and Muscles. 544 



Mr. J. Jago on Ocular Spectres 545 



Proceedings of the Geological Society : — 



Prof. J. Phillips on a Fossil Fruit found in the Upper 



Wealden deposits in the Isle of Purbeck 551 



Mr. C. J. F. Bunbury on some Fossil Plants from Madeira. 551 

 The Rev. T. Brown on a Section of a part of the Fifeshire 



Coast 552 



On Euphotide and Saussurite, by T. Sterry Hunt, Esq 553 



Analysis of the Perowskite of Schelingen, by F. Seneca 554 



Index 555 



PLATES. 



I. Illustrative of Mr. J. J. Waterston's Paper on the Evidence of a Gra- 

 duated Difference between Air- and Mercury-Thermometers. 

 11. Ilhistrative of Mr. W. S. Jevons's Paper on tlie Forms of Clouds, 



III. Illustrative of MM. Bunsen and Schischkoff's Paper on the Chemical 

 Theory of Gunpowder. 



