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Description of a newly-excluded Young of the Omithorhyiichus paradoxus. 

 By Sir Bichard Owen, K.C.B., F.R.S., &c 391 



On the Nephridia and " Liver " of Patella vulgata. By A. B. Griffiths, 

 Ph.D., F.B.S. (Edin.),F.C.S. (Lond. and Paris), Principal and Lecturer 

 on Chemistry and Biology, School of Science, Lincoln 392 



The Air of Sewers. By Professor Carnelley, D.Sc, and J. S. Haldane, 

 M.A., M.B., University College, Dundee 394 



On the Composition of Water by Yolume. By Alexander Scott, M.A., 

 D.Sc 396 



On Muscle Plasma. By W. D. Halliburton, M.D., B.Sc, Assistant 

 Professor of Physiology, University College, London 400 



Dispersion Equivalents. Part I. By J. H. Gladstone, Ph.D., F.R.S 401 



On the Eate at which Electricity leaks through Liquids which are Bad 

 Conductors of Electricity. By J. J. Thomson, M.A., F.R.S., Fellow 

 of Trinity College, and Cavendish Professor of Experimental Physics 

 in the University of Cambridge, and H. F. Newall, M.A., Assistant 

 Demonstrator in Physics, Cambridge 410 



The Development of the Branchial Arterial Arches in Birds, with special 

 Reference to the Origin of the Subclavians and Carotids. By John 

 Yule Mackay, M.D., Senior Demonstrator of Anatomy, University of 

 Glasgow 429 



On Radiation from Dull and Bright Surfaces. By J. T. Bottomley, 

 M.A., F.R.S.E 433 



Note to a Paper on the Blood-vessels of Mustelus Antarcticus (' Phil. 

 Trans..' 1886). By T. Jeffery Parker, B.Sc. Lond., Professor of 

 Biology in the University of Otago 437 



On Rigor Mortis in Fish, and its Relation to Putrefaction. By J. C. 

 Ewart, M.D., Regius Professor of Natural History, University of 

 Edinburgh 438 



Electrochemical Effects on Magnetising Iron. By Thomas Andrews, 

 F.R.S.E., F.C.S 459 



Note on the Functions of the Sinuses of Yalsalva and Auricular 

 Appendices, with some Remarks on the Mechanism of the Heart and 

 Pulse. By M. Collier 469 



On Hamilton's Numbers. By J. J. Sylvester, F.R.S., Savilian Professor 

 of Geometry in the University of Oxford, and James Hammond, 

 M.A. Cant 470 



On the Induction of the Explosive Wave and an Altered Gaseous Condi- 

 tion in an Explosive Gaseous Mixture by a Vibratory Movement. 

 By Lewis T. Wright 472 



Note on a Communication entitled " Preliminary Note on a Balanoglossus 

 Larva from the Bahamas" (' Roy. Soc. Proc.,' vol. 42, p. 146). By W. 

 F. R. Weldon, M A 473 



Note on the Anatomy of Asiatic Cholera as exemplified in Cases occurring 

 in Italy in 1886. By Charles S. Sherrington, M.B., MA 474 



On certain Definite Integrals. No. 15. By W. H. L. Russell, F.R.S 477 



