ix 



Filaments, in which every other structure has its Origin ; a Note 

 showing the confirmation by Agardh, in 1852, of observations re- 

 corded in the Philosophical Transactions for 1842. By Martin 

 Bariy, M.D., F.R.S., F.R.S.E page 293 



On the penetration of Spermatozoa into the interior of the Ovum ; a 

 Note showing this to have been recorded as an established fact in 

 the Philosophical Transactions for 1843. By Martin Barry, M.D., 

 F.R.S., F.R.S.E 295 



Observations on the Anatomy of the Antennae in a small species of 

 Crustacean. Bv John D. M'^Donald, M.D., Assistant Surgeon to 

 H.M.S.V. Torch 295 



On certain Functions of the Spinal Chord. By J. Lockhart Clark, 

 Esq 297 



Nouvelles recherches sur la compressibilite des gaz, et sur les forces 

 elastiques des vapeurs. By V. Regnault 298 



Extract from a letter from Prof. Kamtz addressed to Colonel Sabine 

 on terrestrial magnetism 300 



On the Application of the Law of the Conservation of Energy to the 

 Determination of the Magnetic Meridian on board Ship, when out 

 of reach or oi\t of sight of Land. By W. J. Macquom Rankine . . 303 



Additional remarks to the foregoing paper 304 



A few Remarks on Currents in the Arctic Seas. By P. C. Sutherland, 



M.D 305 



A letter from Mr. Joule to Colonel Sabine on Regnault's experiments. 307 



Experimental Researches on Vegetation. By M. Georges Ville 307 



An Account of Meteorological Observations in four Balloon Ascents 

 made under the direction of the Kew Observatory Committee of the 

 British Association. By John Welsh, Esq 309 



Further Experiments and Observations on the Properties of Light. By 

 Lord Brougham, F.R.S., Member of the Institute of France 312 



Researches on the distribution of the Blood-vessels, &c. in the Lungs. 

 By James Newton Heale, M.D 315 



Theory of the reciprocal Action between the Solar Rays and the differ- 

 ent Media by which they are reflected, refracted or absorbed. By 

 Joseph Power, Esq., M.A., Fellow of Clare Hall and Librarian of 

 the University of Cambridge, &c 317 



On the Anatomy and Physiology of Cordylophora, a contribution to 

 our knowledge of the Tubularian Zoophytes. By George James 

 AUman, M.D., M.R.I.A., Professor of Botany in the University of 

 Dublin, &c 319 



On the Secular Variation of the Moon's Mean Motion. By J. C. 

 Adams, Esq., M.A., F.R.S., &c 321 



On a Theory of the conjugate relations of two rational integral func- 

 tions, comprising an application to the Theory of Sturm's Functions, 

 and that of the greatest Algebraical Common Measure. By J. J. 

 Sylvester, Esq., M.A., F.R.S., Barrister at Law 324 



On the frequent occurrence of Indigo in Human Urine, and on its Che- 

 mical and Physiological Relations. By Arthur Hill Hassall, M.D., 

 Physician to the Royal Free Hospital, &c 327 



