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Researches on Explosives. Fired Gunpowder. By Capt. Noble, late Royal 

 Artillery, F.R.S., F.R.A.S., F.C.S., and F. A. Abel, F.R.S., Treas. C.S. 408 



On the Diuretic Action of Digitalis. By T. Lauder Brunton, M.D., D.Sc., 

 and Henry Power, M.B., F.R.C.S 420 



Description of the Living and Extinct Races of Gigantic Land-Tortoises. 

 Parts I. and II. Introduction, and the Tortoises of the Galapagos Islands. 

 By Dr, Albert Giinther, F.R.S 421 



No. 154. June 18, 1874 (continued). 



On Dredgings and Deep-sea Soundings in the South Atlantic, in a Letter 

 to Admiral Richards, C.B., F.R.S. By Prof. Wyville Thomson, LL.D., 

 F.R.S., Director of the Civilian Staff on board H.M.S. < Challenger.' 423 



On the Centre of Motion in the Human Eye. By J. L. Tupper 429 



Some Observations on Sea-water Ice. By J. Y. Buchanan, Chemist on 

 Board H.M.S. < Challenger ' 431 



On the Physiological Action of the Chinoline and Pyridine Bases. By 

 John G. M'Kendrick and James Dewar, Edinburgh 432 



On the Calculus of Factorials. By the Rev. H. F. C. Logan, LL.D 434 



On the Employment of a Planimeter to obtain Mean Values from the traces 

 of continuously Self-recording Meteorological Instruments. By Robert II. 

 Scott, M.A., F.R.S. ? 435 



Magnetic Observations at Zi-Ka-Wei. By M. Dechevrens, Director of the 

 Observatory ? 440 



Experiments with Safety-Lamps. By William Galloway, Inspector of 

 Mines. (Plates VI. & VII.) 441 



On the Adiabatics and Isothermals of Water. By A. W. Riicker, M.A., 

 Fellow of Brasenose College, Oxford 451 



Contributions to Terrestrial Magnetism. No. XIV. By General Sir Ed- 

 ward Sabine, R.A., K.C.B., F.R.S 461 



Tables of Temperatures of the Sea at various Depths below the Surface, 

 taken between 1749 and 1868 ; collated and reduced, with Notes and 

 Sections. By Joseph Prestwich, F.R.S., F.G.S 462 



On the Sun-spot Period and the Rainfall. By J. A. Broun, F.R.S 469 



On the Mechanism of Stromboli. By Robert Mallet, M.A., F.R.S 473 



List of Presents . . 473 



No. 155. 



On the Absorption of Carbonic Acid by Saline Solutions. By J. Y. 

 Buchanan, Chemist on Board H.M.S. ' Challenger ' 483 



On the Mechanism of Stromboli, By Robert Mallet, M.A., F.R.S 496 



