VI 
Contents. 
PAGE 
On Some Effects of Heat on Electro-Static Attraction. By Prof. Tait, 302 
On the Curves produced by Reflection from a Polished Revolving 
Wire. By Edward Sang, Esq., ..... 302 
On an Ammonia- Cupric Zinc Chloride. By E. W. Prevost, Ph.D., . 302 
On a Peculiarity of the Diurnal Hygrometric Curve at Geneva. By 
Alexander Buchan, Esq., ...... 304 
On Knots. By Professor Tait, ..... 306 
Presentation of the Makdougall-Brisbane Prize to Alexander Buchan, 
M.A., ....... 319, 486 
On the Action of Sulphuretted Hydrogen on the Hydrate and on the 
Carbonate of Trimethyl- Sulphine. By Professor Crum Brown, . 319 
On Links. By Professor Tait, . . . . .321 
Laboratory Notes. By Professor Tait — 
a. Measurement of the Potential required to produce Sparks 
of various lengths, in Air at different pressures, by a 
Holtz Machine. By Messrs Macfarlane and Paton, . 332 
b. The Thermal Conductivity of Gas Coke. By Messrs Knott 
and Macfarlane, ...... 333 
c. Preliminary Experiments on the Currents produced by 
contact of Wires of the same metal at different Tempera- 
tures. By Messrs Knott and Macfarlane, . . 333 
d. On the Relative Percentages of the Atmosphere and of the 
Ocean which would flow into a given Rent in the Earth’s 
Surface. By Professor Tait, .... 333 
On the Biliary Secretion with reference to the Action of Cholagogues. 
By Professor Rutherford, F.R.SS. L. and E., and M. Vignal, . 334 
Specimen of Auriferous Quartz. By Patrick Dudgeon, . . 338 
On a Problem of Arrangements. By Professor Cayley, . . 338 
On the Construction of the Canon of Sines, for the Decimal Division 
of the Quadrant. Edward Sang, Esq., .... 343 
On the Precautions to be taken in recording and using the Records 
of Original Computations. Edward Sang, Esq., . . . 349 
On an Unnamed Palaeozoic Annelid. By Prof. Duns. (Plate IV.), 352 
On Eisenstein’s Continued Fraction. By Thomas Muir, M.A., . 359 
Note on an Infinitude of Operations. By Thomas Muir, M.A., . 359 
Note on Determinant Expressions for the Sum of a Harmonical 
Progression. By Thomas Muir, M.A., .... 361 
Sevenfold Knottiness. By Professor Tait, .... 363 
Exhibition of a Large Map showing the Progress of the Geological 
Survey of Scotland. By Professor Geikie, . . . 367 
Notice of a Saline Water from the Volcanic Rocks of Linlithgow. 
By Professor Geikie, F.R.S., . . . . . 367 
On the Arrangement and Relations of the Great Nerve-Cords in the 
Marine Annelids. By W. C. MTntosh, M.D., F.R.S.E., F.L.S., . 372 
