11 
On Systems of Colliding Spheres. By Professsr Tait, ... 
On the Effect of Pressure on the Maximum Density Point of Water. By 
Professor Tait, . . ... . 
Chemical and Microscopical Studies on the Action of Salicylic Acid on Fer- 
ments. By Dr A. B. Griffiths, F.R.S.E., F.C.S. (Lond. and Paris), 
Lecturer on Chemistry, Technical College, Manchester, &c., 
Monday, 18th January 1886. 
On the Relation between the Densities and the Atomic Weights of the Elemenst. 
By Professor Crum Brown, . . . . 
Observations on Earth-Currents in Ben Nevis Observatory Telegraph Cable. By 
Mr II. N. Dickson. (Plate XIX.), 
On the Partition of Energy among Groups of Colliding Spheres. By Prof. Tait, 
On Water-Bottles, with the description of a new form of Slip Water-Bottle. By 
Hugh Robert Mill, B. Sc., Scottish Marine Station. (Plate XX.), 
On a Repetition of Berth elot’s Experiment on the Tenacity of Water and its 
Adhesion to Glass. By H. Creelman. Communicated by Prof. Tait, 
Monday , 1st February 1886. 
The Theory of Determinants in the Historical Order pf its Development. By 
Thomas Muir, M.A., LL.D., . . . . . ’ . 
The Formation of the Germinal Layers in Teleostei. By Mr George Brook, 
, F.L.S., Lecturer on Comparative Embryology in the University of Edin- 
burgh, . . 
Account of a Preliminary Experiment on the Thermal Conductivity of Ice. By 
Mr A. Crichton Mitchell. (Plate XXI.), 
Monday, 15 th February 1886. 
Chemical Affinity and Solution. By Mr W. Durham, .... 
On the Reproductive Elements in Myxine glutinosa, L. By J. T. Cunningham, 
B.A., . 
The Life-History of the Micro-Organisms associated with Variola and Vaccinia : 
An Abstract of Results obtained from a Study of Small-Pox and Vaccination 
in the Surgical Laboratory of the University of Edinburgh. By J. B. 
Buist, M.D., F.R.C.P., Edinburgh, . . 
On the probable Heats of Formation of Zinc-Copper Alloys. By Mr A. P. 
Laurie, . . . .. . 
On the Mean Free Paths in a mixture of Two Systems of Spheres. By Pro- 
fessor Tait, . . . . 
On Two Shrunk Human Heads from South America. By Prof. Duns. D.D., . 
Monday, 1st March 1886. ^ 
On the Magnitude of the Mutual Attraction between Two Pieces of Matter at 
Distances of less than Ten Micromillimetres. By Sir William Thomson, 
Hon. V.P., . . . . . . . . 
On a Theorem in the Science of Situation. By Professor Tait, 
On Radiation from Snow. By Mr John Aitken, .... 
Comparison of the Volumes of Saline Solutions with the Sums of the Volumes 
of the Constituents. By J. Holmes Pollok, Chemical Laboratory, Glas- 
gow University. Communicated by Sir William Thomson. (Plate 
XXII.), 
On the Increase of Electrolytic Polarisation with Time. By Mr W. Peddie, . 
On Thermometer Screens. By Mr J. Aitken. (Plate XXIII.), 
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