~ XX -~ 



rector of the Civiliaii Scientific Staff, on Work (Chemical 



and Geological) done on board H. M. S. "Challenger." By J. 



Y. Buchanan. 

 On the Force caused hy the Commimication of Heat between a 



Suvface and a Gas, and on a New Photometer. By Professor 



Oshorne Reynolds. 

 On the Nature of the Force prodncing the Motion of a Body 



exposed to Rays of Heat and Light. By Arthur Schuster. 

 On the Number of Figures in the Period of each Reciprocai of a 



Prime from 53,000 to 60,000. By W. Shanhs. 

 On a new Refractometer for measiiring the Mean Refractive Index 



of Plates of Glass and Lenses by the employment of Newton's 



Rings. By G. W. Royston-Pigott. 

 Description of a Mammalian Ovnm in an early condition of Deve- 



lopment. By Edward Albert Schàfer, Assistant Professor of 



Physiology in University College, London. 

 Preliminary Report to the Hydrographer of the Admiralty on some 



of the Results of the Cruise of H. M. S. "Challenger" between 



Hawaii and Valparaiso. By Prof. Wyville Thomson. 

 An Experiment on Electro-Magnetic Rotation. By W. Spottisivoode. 

 The Residuai Charge of the Leyden Jar. By /. Hopkinson. 

 On the Placentation of the Lemurs. By Wm. Turner. 

 On the Movement of the Glass Case of a Radiometer. By William 



Oroohes, F. R. S. &c. 

 Experiments on the Friction between Water and Air. By Dr. Bitter 



von Lang. 

 An Inquiry into the Cause of the slow Pulse in Jaimdice. By J. 



Wickham Legg, M. D. 

 Supplemental Note to a Paper on the Structure, Physiology, and 



Development of Antedon (Comatula, Lamk.) rosaceus. By Wil- 

 liam B. Carpenter. 

 On the Structure of a Species of Millepora occurring at Tahiti, 



Society Islands. By H. N. Moseley. 

 The Bakerian Lecture. — On the Gaseous State of Matter. By 



Prof. T. Andreivs. 

 Reports from the " Challenger .'' 



Voi XXV. N.« 171. N." 172. N.» 173. N.« 174. 

 Supplementary Note on the Theory of Ventilation. By Francis S. B. 



Irangois de ChoMmont. 



