INDEX. 
Alcock Thomas, M.D. — On Frog Tadpoles, pp. 112, 135. 
Axon William, E. A., M.R.S.L. — The Sea Gull in Salford, p. 11. On 
the Numerical Extent of Personal Vocabularies, p. 11. On the 
Pronunciation of Deaf-Mutes who have been taught to Articu- 
late, p. 29. The Colour Sense and Colour Names, p. 77. 
Bailey Charles, F.L.S. — On the British Species of Erythroea, p. 69. 
On a Dwarf Form of Campanulata Glomerata, L., from the Isle of 
Wight, p. 73. On the Isle of Wight Station for Lychnothamnus 
Alopecuroides, Braun, p. 74. 
Baxendell Joseph, F.B.A.S. — Notes on the Variable Stars U Canis 
Minoris, V Geminorum, and U Bootis, p. 183. 
Bottomley James, D.Sc., F.C.S.— On the Mean Intensity of Light that 
has Passed Through Absorbing Media, p. 2. Correction of the 
Formula used in Photometry by Absorption when the Medium is 
not perfectly transparent, p. 5. Note on a Passage of Pollux 
relating to the formation of Purple Dye, p. 40. On the Projection 
of a Solid on Three Coordinate Planes, p. 188. 
Cockle Sir James, F.R.S. — Note on Envelopes and Singular Solutions, 
continued from vol. XVII. p. 15, p, 98. 
Dent Hastings C., C.E. — Lepidoptera of the Shetland Islands, p. 126. 
Gwyther R. F., M. A. — On the Failure of certain Mathematical Solutions 
of the Problem of the Motion of a Solid through a Perfect Fluid, 
p. 9. On Cyclic Motions in a Fluid, and the Motion of Vortex 
Rings of Varying Curvature, p. 32. 
Johnson William H., B.Sc. — O n Professor Bjerkness’s Experiments to 
Demonstrate the Analogies between Electrical and Magnetical 
Phenomena and some Hydrodynamical Phenomena, p. 30. Notes 
on some Experiments made in February, 1881, on the Influence of 
Stress on the Electrical Resistance of Iron and Steel Wires, p. 187, 
