Contents. 
PAGE 
Comparison of the Volumes of Saline Solutions with the Sums of 
the Volumes of the Constituents. By J. Holms Pollok, Chemical 
Laboratory, Glasgow University, Communicated by Sir William 
Thomson. (Plate XXII.), 626 
On the Increase of Electrolytic Polarisation with Time. By Mr W. 
Peddie, ........ 628 
On Thermometer Screens. By Mr J. Aitken. (Plate XXIII.), . 632 
The Volumetric Estimation of Inorganic Nitrites. By G. Arm- 
strong Atkinson, M.B., C.M., Assistant to the Professor of Materia 
Medica in the University of Edinburgh, .... 642 
The Absolute Determination of the Strength of an Electric Current 
by Means of the Balance. By Professor James Blyth, M.A., . 650 
On the Nature of the Relationship between Urea-Formation and 
Bile Secretion. By D. Noel Paton, M.B , C.M., . . . 655 
Note on the Collision of Elastic Spheres. By Professor Tait, . 655 
On some Variations in the Structure of Wood and other Allied 
Fibres. By F. H. Bowman, B.Sc., F.R.S.E., F.L.S., F.C.S., &c. 
(Plate XXIV.), 657 
On the Comparison of the Intensity of Gravity at different Stations. 
By Professor Tait, . . . . . . .672 
On the Reproductive Organs in the Genus Eudrilus , E.P. By 
Frank E. Beddard, M.A., F.Z.S., Prosector to the Geological 
Society of London. (Plate XXV.), . . . .672 
On a new form of Portable Spring Balance for the Measurement of 
Terrestrial Gravity. By Sir W. Thomson, . . . 683 
Measurements of the Electro-Motive Force of a Constant Voltaic 
Cell with Moving Plates. By A. P. Laurie, B.Sc., B.A., . . 686 
Note on the Formation of the Hectocotylus in Rossia. By W. E. 
Hoyle, M.A., . . . . . . .686 
On some Definite Integrals. By Professor Tait, . . . 686 
On Alterations in the Electric Conducting Power of Alloys at their 
Melting Point. By Harry Rainy, M.A., and R. D. Clarkson, 
B.Sc. (Plate XXVI.), . . . . . .686 
Examples upon the Reading of the Circle or Circles of a Knot, By 
the Rev. Thomas Kirkman, M.A., F.R.S., .... 693 
Notes on the Waganda Tribe of Central Africa. By Robert W. 
Felkin, M.D., F.R.G.S., Fellow of the Anthropological Societies 
of London and Berlin, &c. (Plate XXVII.), . . . 699 
On the Drainage Areas of Continents, and their Relation to Oceanic 
Deposits. By John Murray, Esq., ..... 770 
On the Vitality of the Spores of Parasitic Fungi, and the Antiseptic 
Properties of Ferrous Sulphate. By Dr A. P. Griffiths, . .771 
The Action of Benzoylecgonin. By Ralph Stockman, M.D., Assis- 
tant to the Professor of Materia Medica, University of Edinburgh, 771 
