IX 



History of two Cases of Hernia of the Ovaries, in one of which there 

 was a periodical Enlargement of one or other of these Organs. By 

 Henry Oldham, M.D , page 377 



Further Observations on the Anatomy and Physiology of Nautilus. 

 By John Denis Macdonald, Esq., Assistant Surgeon R.N. . . . 380 



Brief Description of a Ctenostomatous Polyzoon, allied to Vesicularia, 

 occurring on the Australian Coast. By John D. Macdonald, Esq. 383 



Observations on the Natural Affinities and Classification of Gastero- 

 poda. By John D. Macdonald, Esq 384 



On the Sea Saw-dust of the Pacific. By John D. Macdonald, Esq. 393 



On what the Colonial Magnetic Observatories have accomplished. 

 By Major-General Sabine, R.A., Treas. and V.P.R.S 396 



On the Immediate Principles of Human Excrements in the Healthy 

 State. By W. Marcet, M.D 413 



Description of a Chronometer Compass. By Ralph Reeder, Esq. . 416 

 Extract of a Letter to General Sabine, from M. R. Wolf . . . .416 



Description of a Species of Asteroid Polypes, probably forming the 

 type of a new genus of Alcyonidce. By John D. Macdonald, Esq. 417 



A System of Train-signalling. By Charles V. Walker, Esq., F.R.S. 418 



On the Action of Aqueous Vapour in disturbing the Atmosphere. 

 By Thomas Hopkins, Esq 421 



On the Structure and Development of the Cysticercus Cellulose, as 

 found in the Muscles of the Pig. By Geo. Rainey, Esq., M.R.C.S.E. 422 



On the Serpentines of Canada and their associated Rocks. By 

 T. Sterry Hunt, Esq., of the Geological Survey of 'Canada . . .423 



On Determinants, better called Eliminants. By Professor Francis 

 Newman, M.A 426 



On an Element of Strength in Beams subjected to Transverse Strain, 

 named by the author ' The Resistance of Flexure.' (Second Com- 

 munication.) By William Henry Barlow, Esq., F.R.S 432 



On the Theory of the Gyroscope. By the Rev. William Cook, M.A. 437 

 Researches on Silica. By Col. P. Yorke, F.R.S 440 



Appendix to Mr. Barlow's Paper " On an Element of Strength in Beams 

 subjected to Transverse Strain," &c. By Peter Barlow, Esq., F.R.S. 442 



On the Application of Parabolic Trigonometry to the Investigation 

 of the Properties of the Common Catenary. By the Rev. James 

 Booth, LL.D., F.R.S. . 443 



On the Magnetic Induction of Crystals. By Prof. Julius Pliicker, 

 of Bonn, For. Memb. R.S 448 



Inquiries into the Quantity of Air inspired throughout the Day and 

 Night, and under the influence of Exercise, Food, Medicine, Tem- 

 perature, &c. By Edward Smith, M.D 451 



VOL. VIII. C 



