Contents. 
ix 
PAGE 
On Mirage. Part II. By Professor Tait, .... 743 
Report of the Boulder Committee, with Remarks by the Convener, 
Mr Milne Home. (Plates IV., V.), .... 743 
Supplement to the Eighth Report of the Boulder Committee, . 787 
On Mirage. Part III. By Professor Tait, . . . .799 
On a Red Resin from Draccena Ginnabari (Balf. fil.) Socotra. By 
Messrs J. J. Dobbie, Assistant to the Professor of Chemistry, 
University of Glasgow ; and G. G. Henderson, B.Sc. Communi- 
cated by Dr Bayley Balfour, . . . . .799 
On Voice-Effort and Rhythm. By the Rev. J. L. Blake. Communi- 
cated by Professor Crum Brown, . . . . .799 
The Effect of Moisture on the Electric Discharge. By A. Macfarlane, 
M.A., D.Sc., and D. Rintoul, M.A., .... 801 
The Heats of Combination of the Metals with the Halogens. By 
Messrs A. P. Laurie and C. I. Burton. Communicated by Prof. 
Crum Brown, ....... 804 
On the Kinetic Theory of Gases in relation to Dissociation. By 
Professor Tait, ....... 806 
On the Change in the Peltier Effect due to Variation in Tempera- 
ture. By Mr Albert Campbell. Communicated by Dr' Knott, . 807 
On the Lowering of the Maximum Density Point of Water by 
Pressure. By Professor D. H. Marshall, Professor C. Michie 
Smith, and Mr R. T. Omond, ..... 809 
Note on the Preceding Paper. By Professor Tait, . . .813 
Vocalisation and Articulation. By the Rev. J. L. Blake. Com- 
municated by Dr Crum Brown, . . . . .815 
On the Order of Succession of Rocks in the North-West Highlands. 
By Professor Heddle, . . . . . .815 
On the Rotation of the Plane of Polarisation by Quartz, and its 
relation to Wave-Length. By Mr W. J. Peddie. Communicated 
by Professor Tait, . . . . . . .815 
On the Condition of Ammonium Salts when dissolved in Water. 
By W. W. J. Nicol, M.A., B.Sc. Part I., . . . . 819 
On a Solar Calorimeter, and some Observations made with it in 
Upper Egypt. By Mr J. Y. Buchanan, . . . . 827 
On the Heats of Combination of the Metals with the Halogens. By 
Messrs A. P. Laurie, B.Sc., and C. I. Burton, . . . 830 
On the Nature of Solution. By Mr W. L. Goodwin. Communi- 
cated by Professor Crum Brown, ..... 834 
Diagnoses plantarum novarum et imperfecte descriptarum Phanero- 
gamarum Socotrensium, quas elaboravit Bayley Balfour, Scientiee 
Doctor et in Universitate Glascuensi rerum botanicarum regius 
professor. Pars altera, ...... 834 
Review of the Session, ...... 843 
Donations to the Library, ...... 845 
Index, ......... 871 
