880 
Index. 
Palseoniscidse : Their Structure, by Dr. 
R. H. Traquair, 217. 
Parmeliece Socotrenses, 458. 
Pasteur Medal, Invitation to sub- 
scribe for, 743. 
Peach (B. Neeve) elected a Fellow of 
the Society, 175. 
Some New Species of Fossil 
Scorpions, with a Review of the 
Genera Eoscorpius andMazonia, 245. 
Crustacea and Scorpions of 
the Carboniferous Rocks of the 
Scottish Border, 603. 
Peddie (W.), Rotation of the Plane of 
Polarisation by Quartz, and its re- 
lation to wave-lengths, 816. 
Pedicellarige : Their Histology, by 
Patrick Geddes, F.R.S.E., and F. 
E. Beddard, B.A., 88. 
Peirce (Professor Benjamin), Obituary 
Notice of, 739. 
Peltier Effect due to Variation in 
Temperature, by Albert Campbell, 
807. 
Permanent Symmetric Functions, 409 ; 
Symmetric Functions distinguished 
from Alternating Functions ; Deter- 
minants may be placed under the 
class of Alternating Functions, 409 ; 
Products of Permanents and Deter- 
minants of the ?i th Order, 411. 
Phoronis. — Note on a Plioronis 
Dredged in H.M.S. “Challenger,” 
by Dr. W. C. Macintosh, 211. 
Phosphate of Sodium, 46. 
Phosphorus : Its Action on Steel, by 
Dr. R. S. Marsden, 566. 
Phosphorus Betaines, by Prof. E. A. 
Letts, 40. 
Physcice Socotrenses , 459. 
Pitchstone-Porphyry River of the 
Scuir of Eigg, 632. 
Placodiece Socotrenses , 459. 
Placopoda Socot., 835. 
Plane of Polarisation, Rotation of, 
by Quartz, 816. 
Planispirina contraria , 713. 
Planorbis : Its Anatomy, by F. E. 
Beddard, B.A., 576. 
Plantamour (Professor Emile) elected 
a Foreign Honorary Fellow, 94. 
Plarr (Dr. Gustav) on a Particular 
Case of the Symbolic Cubic, 342. 
on Minding’ s Theorem, 528. 
Platvsomidse : Their Structure, by Dr. 
R. H. Traquair, 217. 
Pleurochceta Moseleyi, The Anatomy 
and Histology of, by F. E. Beddard, 
B.A., 629. 
Polarisation (Galvanic), by Professor 
Helmholz, 202. 
Polarisation, Rotation of the Plane of, 
816. 
Polycarpa, Heller, a Genus of the 
Cyntliiadse. 
irregularis , new species, 72. 
longisiphonica , new species, 77. 
minuta , new species, 78. 
molguloides, new species, 76. 
pedata, new species, 71. 
pilella , new species, 73. 
guaclrata, new species, 78. 
radicatus, new species, 75. 
— — rigicla, new species, 76. 
sulcata , new species, 73. 
tinctor (Quoy and Guinard), 
74. 
viriclis, new species, 74. 
Polyzoa of the Faroe Channel, by Dr. 
G. Busk, 690. 
Pompeii and Herculaneum — Historic 
Evidence of their Destruction : An 
Address by Rev. Dr. Cazenove, 421 ; 
Evidence of Martial, 425 ; Evidence 
of Plutarch, 426 ; Evidence of 
Statius, 427 ; Evidence of Tacitus, 
430 ; Evidence of Josephus, 432 ; 
Evidence of Suetonius, 433 ; Evi- 
dence of the Younger Pliny, 433 ; 
Evidence of Dion Cassius, 437 ; Evi- 
dence of Marcus Aurelius, 441. 
Ponton (Mungo), W.S., Obituary 
Notice of, 100. 
Pressure. — Crushing of Glass by Pres- 
sure, by Professor Tait, 204. 
on the Average Pressure due 
to Impulse of Vortex Rings on a 
Solid, by Sir William Thomson, 
204. 
■ on the Compression of Gases 
by High Pressures, 293. 
Pressure-Errors of the “Challenger” 
Thermometers, by Prof. Tait, 199. 
Note on the Heating produced 
by Compression, 21 7. 
Prizes. — The Makdougall - Brisbane 
Prize for the Biennial Period 1879-81 
awarded to Professor Piazzi Smyth, 
Astronomer-Royal for Scotland, 361. 
Keith Prize for 1879-81 
awarded to Professor Chrystal, 743. 
Neill Prize for 1877-80 
awarded to John Murray, 743. 
Pryde (Dr. David) elected a Fellow of 
the Society, 637. 
Pseudopodium : How produced, 31. 
Psilomelane, 549. 
Psoreoe Socotrenses, 460. 
Pulvinulina scitula, 716. 
Pycnogonida of the Faroe Channel, 
689. 
Pyrenuleoe Socotrenses, 471. 
