666 
Index. 
Petroleum, American, most Volatile 
Constituents of, 176. 
Pettigrew (James B,, M.D.) on the 
Anatomy and Physiology of the 
Mitral, Tricuspid, and Semilunar 
Valves in Mammals, Birds, Kep- 
tiles, and Fishes, 193. 
• on the Ganglia and Nerves 
of the Heart, 452. 
Peziza ceruginosa, Colouring Matter 
of, 439. 
Philosophy, Natural, Sealed Note 
deposited with Secretary, 156. 
Phlogistic Theory, Note on, 328. 
Pictish Inscription in the Church- 
yard of St Vigeans, 113. 
Playfair (Dr Lyon) on the Food of 
the Eoyal Engineers stationed at 
Chatham, 421. 
Polarisation of Bough Surfaces, 96. 
Polarisation o f the Atmosphere, 
100 . 
Polarisation of the Atmosphere, Ob- 
servations on, 520. 
Prince of Wales, Address to, 126. 
Projectiles, Elliptic Motion of unre- 
stricted, 565. 
Pteropod, External Anatomy of a new 
Mediterranean, 155. 
Pygopterus Greenockii (Agassiz), De- 
scription of, 597. 
Pyramid, Great, Metrology of, 198. 
Kecent Measures at, 640. 
Quaternion Transformation, Note on, 
115. 
Kankine (W. J. Macquorn) on Satu- 
rated Vapours, 449. 
Eefractor at Elchies, Eemarks on, 
by Professor C. Piazzi Smyth, 47. 
Eeilly’s Topographical Survey of the 
Chain of Mont Blanc, 335. 
Eetina, New Property of, 573. 
Eichter (Otto, Ph.D.) on the Chemi- 
cal and Physical Principles in con- 
nection with the Specific Gravity 
of Liquid and Solid Substances, 
226. 
Eigveda, Gods of the, 183. 
Eonalds (Edmund, Ph.D.) on the 
most Volatile Constituents of Ame- 
rican Petroleum, 176. 
Sang (Edward), Notice of a Simple 
Method of Approximating to the 
Boots of any Algebraic Equation, 
162. 
An Essay on the Theory of 
Commensurables, 184. 
Sang (Edward), on the Solution of 
Perigal’s Problem concerning the 
Contact of Epicycloidal Curves, 338. 
on the Motion of a Heavy 
Body along the Circumference of a 
Circle, 408. 
on the Third Co-ordinate 
Branch of the Higher Calculus, 
556. 
• on Functions with Eecurring 
Derivatives, 594. 
Sanskrit Literature, Sketch of the 
Eecent Progress of, by John Muir, 
D.C.L., LL.D., 90. 
Scoresby- Jackson (E. E., M.D., 
F.E.C.P.) on the Influence of 
Weather upon Disease and Morta- 
lity, 86. 
• on the Temperature of certain 
Hot Springs in the Pyrenees, 160. 
Seller (William, M.D.) on Vital 
Agency with reference to the Cor- 
relation of Forces, 209. 
Shells, Arctic, Glacial-Clay with, 257. 
Drift Beds with, 157. 
Fossil Arctic, 96. 
Simpson (Professor J. Y.), Note on 
the Anatomical Type in the Funis 
Umbiliculis and Placenta, 112. 
Note on a Pictish Inscription 
in the Churchyard of St Vigeans, 11 3. 
Notices of some Ancient 
Sculptures on the Walls of Caves 
in Fife, 521. 
Skene (W. F.) on the Celtic Lan- 
guages in their Delation to each 
other, and to the Teutonic Dia- 
lects, 202. 
on the Celtic Topography of 
Scotland, 432. 
Skey (William) on the Absorption of 
Substances from Solutions by Car- 
bonaceous Matters, and the Growth 
thereby of Coal Seams, 643. 
Skull, Human, Congenital Deformi- 
ties of, 444. 
Skulls, Human, allied in Anatomi- 
cal Characters to the Engis and 
Neanderthal, 161. 
Skulls of Gorilla, Observations rela- 
tive to their Anatomical Features, 
341. 
Small (John, M.A.), Biographical 
Sketch of Adam Ferguson, LL.D., 
F.E.S.E., 214. 
Unpublished Letter of the 
late Professor Dugald Stewart, 215. 
Smith (John, M.D.) on certain Points 
in the Morphology of Cleft Palate, 
575. 
