Contents. 
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On Systems of Colliding Spheres. By Professsr Tait, , .527 
On the Effect of Pressure on the Maximum Density Point of Water. 
By Professor Tait, ....... 527 
Chemical and Microscopical Studies on the Action of Salicylic Acid 
on Ferments. By Dr A. B. Griffiths, F.R.S.E., F.C.S. (Loncl. 
and Paris), Lecturer on Chemistry, Technical College, Man- 
chester, &c., . . . . . . . . 527 
On the Relations between the Densities and the Atomic Weights of 
the Elements. By Professor Crum Brown, . . . 530 
Observations on Earth-Currents in Ben Nevis Observatory Telegraph 
Cable. By Mr H. N. Dickson (Plate XIX.), 
On the Partition of Energy among Groups of Colliding Spheres. By 
Professor 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 Berthelot’s Experiment on the Tenacity of Water 
and its Adhesion to Glass. By H. Creelman. Communicated by 
Professor Tait, ....... 
The Theory of Determinants in the Historical Order of its Develop- 
ment. 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 Edinburgh, ...... 
Account of a Preliminary Experiment on the Thermal Conductivity 
of Ice. By Mr A. Crichton Mitchell. (Plate XXI.), 
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 Professor Tait, ....... 
On Two Shrunk Human Heads from South America. By Professor 
Duns, D.D., ........ 
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, 
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