1006 
Index. 
can so exist as to have the Motions 
of the Points, relative to it, Recti- 
linear and Mutually Proportional, 
by Prof. James Thomson, 730. 
Power, its Transmission by Alternate 
Currents, by Prof. George Forbes, 141. 
Prizes. — Keith Prize (1881-83), 
awarded to Mr Thomas Muir, 562. 
Makdougall - Brisbane Prize 
(1880-82), awarded to Prof. James 
Geikie, 565, 
Neill Prize (1880-83), awarded 
to Prof. Herdman. 
Principle of Least Action, 14. 
Protista, by Patrick Geddes, 273, 275. 
Protozoa, their Classification and 
Affinities, by Patrick Geddes, 269, 
276. 
Protophyta, Affinities of, by Patrick 
Geddes, 272, 275. 
Pycnogonida, dredged in Faroe Channel 
during Cruise of “ Triton,” by Dr 
P. P. C. Hoek. 
Quaternion Expression of the Finite 
Displacements of a System of Points 
of which the Mutual Distances re- 
main Invariable, by M. le Docteur 
Gastave Plarr, 151. 
Quaternion Differences, An Equation 
in, by Prof. Tait, 561. 
Radiation, by Professor Tait, 531. 
Radiation Thermometers, 682. 
Radiolarian Ooze, 512. 
Rainband, Observations of, from June 
1882 to January 1883, by Hugh 
Robert Mill, B.Sc., 47. 
Rainy (Harry), on a singular Electrical 
Result, 755, 
Reference Frames, by Professor Tait, 
743. 
Renard (M. PAbbe A,), and Mr John 
Murray, on the Microscopic Characters 
of Volcanic Ashes and Cosmic Dust, 
and their Distribution in the Deep 
Sea Deposits, 474. 
On the Nomenclature, Origin, 
and Distribution of Deep Sea De- 
posits, 495. 
On a large Crystal of Calc-Spar 
found in Loch Corrib by Prof. Tait, 
530. 
On Cosmic Dust, 599. 
Reproduction, Sexual, 281. 
Rest (Absolute Clinural), by Prof. 
James Thomson, 568. 
Rhodium and Iridium, their Thermo- 
Electric Positions, 136. 
Ribs, the so-called Bicipital, by Prof. 
William Turner, 127. ^ 
Royal Society of Edinburgh, Review 
of its Hundred Years’ History, by 
liord Moncreiflf, 451. 
Rotation (Absolute), by Prof. James 
Thomson, 568. 
Rubiaceee of Socotra, 405. 
Sang (Edward), LL.D., on the Impos- 
sibility of Inverted Images in Air, 129. 
On some Properties of the Line 
of Simple Flexure, 172. 
On the Problem of the Lathe- 
Band, and on Problems connected 
therewith, 294. 
Approximation to the Roots of 
Cubic Equations by help of Recur- 
ring Chain Fractions, 387. 
On the Need for Decimal Sub- 
divisions in Astronomy and Navi- 
gation, and on Tables requisite there- 
for, 533. 
On the Construction of the 
Canon of Logarithmic Sines, 601. 
On the Computation of Recur- 
ring Functions by the Aid of Chain- 
Fractions, 703. 
Santalacepe of Socotra, 93. 
Saxon Tenure of Land, 108. 
Schuster (Professor), Address by, 646. 
Scrophularinese of Socotra, 84. 
Sea. — Effect of Oil on a Stormy Sea, 
56 ; Effect on the Formation of 
Waves, 68. 
Selaginese of Socotra, 90. 
Sensations. — The Limitations in Time 
of Conscious Sensations, by Prof. 
J. B. Haycraft, 246. 
Seton (George) M.A., on Illegitimacy 
in Scotland, 18. 
On Scottish Vital Statistics, 619. 
Shetland, Old Red Sandstone Volcanic 
Rocks of, 593. 
Shingle Beaches in Colonsay and Oron- 
say, 208. 
Sladen (W. Percy) on Asteroidea 
dredged in Faroe Channel, 231. 
Sling Thermometers, 689. ^ 
Smith (Professor Michie) on Integrat- 
ing Hygrometer, 593. 
Observations on a Green Sun 
and associated Phenomena, 755. 
Smith (Rev. Dr W. Robertson), on Dr 
Guebhard’s Electro-Chemical Method 
of figuring Equipotential Lines, 7. 
Smyth (Prof. C. Piazzi) communicates 
Message from Mr J. R. Hind as to 
Transit of Venus, 7. 
On an Influx of Warm Wind on 
the night of 28th January 1883, 75. 
feight Clouds on a Dark Sky, 
223. 
