IV 
Contents. 
PAGE 
On the Carboniferous Volcanic Rocks in the Basin of the Firth of 
Forth — their Structure in the Field and under the Microscope. 
By Professor Geikie, F.R.S., . . . . .65 
Exhibition of Specimens of Auriferous Quartz from the Leadhills 
District. By Patrick Dudgeon, Esq. of Cargen, . . .67 
On some Physiological Results of Temperature Variation. By J. B. 
Haycraft, M.B., C.M. Communicated by Professor Turner, . 68 
On the Elasticity of the Walls of the Arteries and Veins. By Dr 
Roy. Communicated by Dr George W. Balfour, . . 68 
Further Note on the Distribution of Temperature under the Ice in 
Linlithgow Loch. By J. Y. Buchanan, M.A., . . .68 
Heating and Ventilating of Churches and other Buildings : Report 
of a series of Experiments made in a Hall in Upper Grove Place. 
By Charles J. Henderson, Edinburgh. Communicated by Pro- 
fessor Jenkin, . . . . . . .72 
Chapters on the Mineralogy of Scotland. Chapter VI. “ Chloretic 
Minerals.” By Professor Heddle, . . . . .76 
On Deep-Sea Thermometers. By J. Y. Buchanan, . . .77 
Preliminary Note on a Crystalline Compound formed in Water con- 
taining Sulphuretted Hydrogen and Mercaptan in Solution. By 
J. Adrian Blaikie, B.Sc., . . . . . .87 
Laboratory Notes. By Professor Tait — 
(1.) Measurements of the Electromotive Force of the Gramme 
Machine at different Speeds, . . . .90 
(2.) On the Law of Extension of India-rubber at different 
Temperatures, . . . . . .92 
Election of Four Foreign Honorary Fellows, . . . .92 
On Gravitational Oscillations of Rotating Water. By Sir William 
Thomson, . ... . . .92 
On the Effects of Chloroform, Ethidene Dichloride, and Ether on 
Blood- Pressure. By Joseph Coats, M.D., William Ramsay, Ph.D., 
and John G. M‘Kendrick, M.D., University of Glasgow. Com- 
municated by Professor M‘Kendrick, . . . .100 
Experiments with Rotating Discs. By John Aitken. Communi- 
cated by Professor M‘Kendrick, . . . . .102 
General Theorems on Determinants. By Thomas Muir, M.A., . 102 
Preliminary Note on Alternants. By Thomas Muir, M.A., . . 102 
Professor Geddes’s Theory of the “ Iliad.” By Professor Blackie, . 103 
The Principles of the Algebra of Logic. Part III. — Application to 
certain Problems in the Theory of Probability. By Dr Alexander 
Macfarlane, . . . . . . . .105 
The Anatomy of the Northern Beluga ( B . Catodon ) compared with 
that of other Whales. By Morrison Watson, M.D., and Alfred 
H. Young, M.B., &c., Owens College, Manchester, . .112 
Fifth Report of the Boulder Committee. By D. Milne Home, 
LL.D., 113 
Notes by William Jolly, Inverness, on the Transportation of Rocks 
found on the South Shores of the Moray Firth, . . .178 
