- XIX - 



Letter to the President from P. Oimliffe Owen. 



Letter to the President from T. J. Phillips Jodrell. 



On determining the Depth of the Sea without the use of the 

 Sounding-line, and on an Attraction-meter. By C. William 

 Siemens. 



On Instruments for Kecording the Direction and Velocity of Cur- 

 rents and the Temperature of the Water at different Depths 

 in the Ocean. By J". Rymer Jones, of the Imperiai Govern- 

 ment Telegraphs, Japan. 



The Organ of Corti in Mammals. By Urhan Pritchard. 



Preliminary Note on the Compound Nature of the Line-Spectra 

 of Elementary Bodies. By J. N. Lochyer. 



On the Influence of Coal-dust in CoUiery Explosions. By W. Gal- 



On the Diurnal Variations of the Disturbances of the Magnetic 

 Declination at Lishon. By J. Capello^ Director of the Lisbon 

 Observatory. 



On the Development of the Crustacean Embryo, and the Variations 

 of form exhibited in the Larvse of 38 Genera of Podophthal- 

 mia. By C. Speme Baie. 



On a Secular Variation in the Rainfall in connexion with the 

 Secular Variation in amount of Sun-spots. By Charles Mel- 

 drum, M. A., Director of the Mauritius Observatory. 



Preliminary Reports to Professor Wyville Thomson, Director of the 

 Civilian Scientific Staff, on Work done on board the 

 "Challenger." By John Murray. 



Preliminary Report to Professor Wyville Thomson, F. R. S., Director 

 of the Civilian Staff, on the true Cosals dredged by H. M. 

 S. "Challenger," in deep water, between the dates Dee. 30th, 

 1870, and August 31st, 1875. By H. N. Moseley, Naturalist 

 to the Expedition. 



Preliminary Report to Professor Wyville Thomson, F. R. S., Di- 

 rector of the Civilian Scientific Staff, on Observations made 

 during the earlier part of the Voyage. By the late Dr. Rudolf 

 von WiUemoes-Suhm. 



Preliminary Report to Professor Wyville Thomson, F. R. S., Di- 

 rector of the Civilian Scientific Staff, on Crustacea observed 

 during the Cruise of H. M. S. "Challenger" in the Southern 

 Sea. By the late Dr. Rudolf von WillemÒes-Suhm. 



Preliminary Report to Professor Wyville Thomson, F. R. S., Di- 



