VI 
CONTENTS. 
On the Temperature of the Common Fowl ( Gallus domesticus). 
By the late Dr John Davy. Communicated by Professor Allman, 288 
Note on an Inequality. By Professor Tait, . . . .292 
Observations on the Spores of Crypt.ogamic Plants, and on the Repro- 
ductive Process in some Algae and Fungi. By Professor Balfour, . 294 
Note on a Recent High Tide on the East Coast of Britain. By George 
Robertson, M. Inst. C.E. (Plate), ..... 296 
The Mean Pressure of the Atmosphere over the Globe for the Months 
and for the Year. Part I. — January, July, and the Year. By 
Alexander Buchan, M.A., Secretary to the Scottish Meteorological 
Society, ........ 303 
On the History of the Sun’s Distance Determinations ; and on Scrip- 
tural and Scientific Probabilities. By William Petrie, Esq. Com- 
municated by Professor C. Piazzi Smyth, .... 307 
Physical Proof that the Geometric Mean of any Number of Quantities 
is less than the Arithmetic Mean. By Professor Tait, . . 309 
On the Dissipation of Energy. By Professor Tait, . . . 309 
On the Flow of Solids, with Practical Application in Forgings, &c. 
By M. Tresca, Sub-Director of the Conservatoire des Arts et Metiers, 
Paris. Communicated by T. C. Archer, Esq., . . .311 
On the Figures of Equilibrium of Liquid Films. By Sir David Brewster, 311 
Notice of Works designed by Sir Charles Hartley, C.E., for the Im- 
provement of the Danube. By David Stevenson, Civil Engineer, . 313 
Remarks on two Pyramid Papers in the last published number of the 
“Proceedings” of the Royal Society of Edinburgh. By Professor 
C. Piazzi Smyth, ....... 316 
On the Products of the Destructive Distillation of Animal Substances. 
Part V.— -Action of Sodium on Pyridine. By Professor Anderson, 
Glasgow, ........ 379 
On the Structure of the British Nemerteans ; and new British Anne- 
lids. By W. Carmichael MHntosh, M.D., F.L.S., . . . 379 
Donations to the Library, . . . . . .379 
Opening Address, Session 1868-69. By Professor Christison, . 392 
On the Colour of Aerial Blue. By Sir George Harvey, . . 430 
On the Rotation of a Rigid Body about a Fixed Point. By Professor 
Tait, 430 
An Investigation into some previously undescribed Tetanic Symptoms 
produced by Atropia in Cold-Blooded Animals. By Dr Thomas 
R. Fraser, ........ 434 
On Rhabdopleura, a New Genus of Polyzoa. By Professor Allman, . 438 
Donations to the Library, ...... 440 
Notice of a Heart in which the Superior Vena Cava possessed a Valve 
at its Auricular Orifice. By Professor Turner, . . . 455 
On the Motion of a Pendulum affected by the Rotation of the Earth 
and other Disturbing Causes. By Professor Tait, . . . 458 
On the Connection between Chemical Constitution and Physiological 
Action. ........ 461 
