Index. 
779 
Spectra (Gaseous) in Vacuum Tubes, by 
Professor Piazzi Smyth, 711. 
Spectrum. — A new variety of Ocular 
Spectrum, by J ohn Aitken, 40. 
Spherical Harmonics, by Professor 
Tait, 280. 
Sprague (Thomas Bond) on the Pro- 
bability that a Marriage entered into 
by a man above the age of forty will 
be Fruitful, 202. 
Star 103 Tauri (B. A. C. 1572).— Its 
Occultation, by E. Sang, 546. 
Steam-Pressure Thermometers of Sul- 
phurous Acid, Water, and Mercury, 
by Sir William Thomson, 432, 532, 
535, 536. 
Stevenson (David), M.I.C.E., contributes 
an Obituary Notice of Alexander 
James Adie, C.E., 329. 
Stevenson (William) on Ice Action in 
Berwickshire, 593. 
Stirling (A. B. ), Additional Observations 
on the Fungus Disease affecting 
Salmon and other Fish, 232, 370. 
Striated Rocks in East Lothian and in 
some adjoining Counties, 256. I. 
East Lothian Striated Rocks, 258. 
II. Striated Rocks in adjoining 
Counties. III. Information obtained 
by Study of Boulders, 265 ; Con- 
clusion, 268, by David Milne-Home, 
LL.D. 
Subepiphysal Bone Growth, by Dr De 
Burgh Birch, 706. 
Submarine Banks, Remarks on, by David 
Milne-Home, LL.D., 195. 
Sulphide of Potassium, its Action upon 
Chloroform, by W. W. J. Nicol, 
425. 
Sulphuretted Hydrogen, 87. 
Sulphurous Acid, Water, and Mercury 
Thermometers, by Sir William Thom- 
son, 432. 
Sulphurous Acid Steam-Pressure Ther- 
mometer, by Sir William Thomson, 
532, 535, 536. 
Sulphurous Acid Steam* Pressure Differ- 
ential Thermometer, by Sir William 
Thomson, 532, 535, 536. 
Sulphurous Acid Cryophorus, by Sir 
William Thomson, 452. 
Sulphydrate of Potassium, 425. 
Sun. See Solar Spots. 
Symmetrical Angles in the case of Knots, 
49 . _ 
Synascidiee, 720. 
Tait (Professor), Measurement of Thom- 
son effect by the aid of currents from 
the Gramme Machine, 49. 
Tait (Professor), Experimental Deter- 
mination and Measurements of the 
Electromotive Force of the Gramme 
Magneto-Electric Machine, 55, 90. 
On the Law of Cooling of Bars, 
55. 
Laboratory Note on Elasticity 
of India-Rubber at different tempera- 
tures, 52, 92. 
Measures of Radiometer Con- 
stants, 272. 
Note on the Velocity of Gaseous 
Particles at the Negative Pole of a 
Vacuum Tube, 430. 
on the Accurate Measurement 
of High Pressures, 572. 
on Comets, 367. 
on some Applications of Rotatory 
Polarization, 431, 473. 
on the Colouring of Maps, 501. 
Remarks on Professor Guthrie’s 
Communication on the Colouring of 
Maps, 729. 
Mathematical Notes, 400 : — 
(а) on a Problem in Arrangements (case 
of arrangements of boys in a class). 
(б) on a Graphical Solution of the 
Equation Ypcpp^O. 
Quaternion Investigations con- 
nected with Minding’s Theorem, 
200 . 
Further Researches on Minding’s 
Theorem, 272. 
on Methods in Definite Integrals, 
271. 
on Spherical Harmonics, 280. 
Note on the Theory of the 
Fifteen Puzzle, 664. 
contributes Obituary Notices of 
Professor Kelland, President of the 
Society, 321, and of Professor Clerk- 
Maxwell, 331. 
Tauri 103. — Occultation of, by E. Sang, 
546. 
Teeth of Mesoplodon Layardii , and 
Mesoplodon Sowerbyii , 250. 
Teeth of the Basking Shark, by Profes- 
sor Turner, 457. 
Telephone. — Some Experiments with the 
Telephone, by James Blyth, M.A., 45. 
on Currents produced by Friction 
between conducting substances, and 
on a new form of Telephone Receiver, 
by James Blyth, M.A., 548. 
On a new Telephone Receiver, 
by Professor Chrystal, 682. 
On the Differential Telephone, 
and the application of the Telephone 
to Electrical Measurement, by Pro- 
fessor Chrystal, 685. 
