IV 



Page 



On the Potential Difference required to produce a Spark between two 

 Parallel Plates in Air at different Pressures. By J. B. Peace, M.A., 

 Fellow of Emmanuel College, Cambridge ................................................ 99 



Electro-chemical Effects on Magnetising Iron. Part IV. By Thomas 

 Andrews, F.R.S., M.Inst.C.E ..................................................................... 114 



Note on the Spectra of the Flames of some Metallic Compounds. By 

 G. D. Liveing, M.A., F.E.S., Professor of Chemistry, and J. Dewar, 

 LL.D., F.R.S., Jacksonian Professor, University of Cambridge. 

 [Plate 1] ........................................................................................................ 117 



Preliminary Note on the Pressure developed by some New Explosives. 

 By Captain Noble, C.B., F.R.S ................................................................. 123 



The Reserve Proteid of the Asparagus Root. By S. H. Vines, F.R.S., 

 and J. R. Green, M.A., F.L.S ................ ..................................................... 130 



Note oja the Structure .of Rhdbdopleura. By G. Herbert Fowler, 

 B.A., Ph.D., Assistant in the Zoological Laboratory of University 

 College, London ........... . ................................................................................ 132 



On the Flask-shaped Ectoderm and Spongoblasts in one of the Kera- 

 tosa. By George Bidder ............................................................................ 134 



Contributions to the Anatomy of Fishes. II. The Air-Bladder and 

 Weberian Ossicles in the Siluroid Fishes. By T. W. Bridge, M.A., 

 Professor of Zoology in the Mason College, Birmingham, and A. C. 

 Haddon, M.A., Professor of Zoology in the Royal College of Science, 

 Dublin ............................... . ........................................................................... 139 



On the early Development of Cirripedia. By Theo. T. Groom, B.A., 

 B.Se., F.G.S., Demonstrator in Zoology at the Yorkshire College, 

 Leeds, late Scholar of St. John's College, Cambridge ............................ 158 



Thermal Radiation in Absolute Measure. By J. T. Bottom ley, M.A., 

 D.Sc., F.R.S .......... ............................................ .. ........................... . ........... ; 162 



The Cerebrum of Ornithorhynchus paradoxus. By Alex. Hill, M.D ..... 163 

 Contribution to the History of the Interchange of Pulmonary 

 Gases in the Respiration of Man. By William Marcet, M.D., 

 F.R.S. [Title only} .................................... ... ................................ '. ........... 164 



Magnetic Properties of Pure Iron. By Francis Lydall and Alfred 

 W. S. Pocklihgton. [Title only] ................................ .. .............................. 164 



On the Alimentary Canal of Pontia brassica*. By A. B. Griffiths. [Title 

 oity] ............................ . ........ , ....... . ................ . ................................................. 165 



On a new Method for the Bacteriological Examination of Water, and on 

 a new Bacillus discovered in Rain-water. By A. B. Griffiths. [Title 

 onl y] ................................................................................................................ 165 



List of Presents 



No. 316. 



On a Multiple Induction Machine for producing High Tension Elec- 

 tricity, and on some remarkable Results obtained with it Bv Lord 

 Armstrong, C.B., F.R.S. [Plates 213] \ .. ne 



On the Simultaneity of Magnetic Variations at different places on occa- 

 sions of Magnetic Disturbance, and on the Relation between Magnetic 

 and Earth Current Phenomena. By William Ellis, F.R.A.S. Super- 

 intendent of the Magnetical and Meteorological Department Roval 

 Observatory, Greenwich 191 



