INDEX. 
Nicholson (Prof. J. §8.) on the best 
methods of ascertaining and mea- 
suring variations in the value of the 
monetary standard, 485 ; on the statis- 
tical data available for determining 
the amount of the precious metals in 
use as money, &c., 498. 
Nicol (Dr.) on the properties of solutions, 
310; on the bibliography of solution, ib. 
Noble (Capt.), Address to the Mechanical 
Section by, 930. 
Nomad tribes of Asia Minor and Northern 
Persia, report on the geography and the 
habits, customs, and physical characters 
of the, and on excavating on sites of 
ancient occupation, 535. 
North-western tribes of the Dominion of 
Canada, sixth report on the physical 
characters, languages, and industrial 
and social condition of the, 553; re- 
marks on the ethnology of British 
Columbia, by H. Hale, ib.; second 
general report on the Indians of 
British Columbia, by Dr. F. Boas, 562. 
Ohm, suggestions towards a determina- 
tion of the, by Prof. J. V. Jones, 732. 
Oliver (Prof. F. W.) on the floral biology 
of Episcia maculata, 869. 
*Optique minéralogique —achromatisme 
des franges, by Prof. E. Mascart, 752. 
*Ordnance Survey, the present state of 
the, and the paramount necessity for a 
thorough revision, by H. T. Crook, 896. 
*Ornithology of the Sandwich Islands, 
Prof. A. Newton on the, 852. 
Orthophote, the, by J. T. Brown, 778. 
O’Shea (L. T.), the effect of oxidation on 
the magnetic properties of manganese 
‘steel, 753. 
Osmond (M.), notes on the report on 
molecular phenomena associated with 
the magnetisation of iron (phenomena 
occurring at a red heat), 157. 
Ostwald (Prof. W.) on the electrical be- 
haviour of semipermeable membranes, 
331; on the theory of solution, 333; 
on the action of semipermeable mem- 
branes in electrolysis, 746. 
Oxidation, the effect of, on the magnetic 
properties of manganese steel, by L. T, 
O’Shea, 753. 
Oxides, the more stable, the behaviour of, 
at high temperatures, by Dr. G. H. 
Bailey and A. A. Read, 773. 
Palgrave (R. H. Inglis) on the best 
methods of ascertaining and measur- 
ing variations in the value of the 
monetary standard, 485; on the statis- 
tical data available for determining 
the amount of the precious metals in 
use as money, &c., 498. 
999 
Panton (J. H.), the flora of Victoria Park 
Niagara Falls, Ontario, Canada, 871. 
Paraguay, from, to the Pacific, by M. A. 
Thouar, 893. 
Peat overlying a lacustrine deposit at 
Filey, Rev. EK. M. Cole on, 823. 
Pengelly (W.) on the erratic blocks of 
England, Wales, and Ireland, 340; 
on the circulation of underground 
waters, 352; on the nomad tribes of 
Asia Minor and Northern Persia, 535; 
on the prehistoric inhabitants of the 
British Islands, 548. 
Peradeniya, Ceylon, fourth report on the 
steps taken for establishing a botanical 
station at, 470. 
Perkin (Dr. W. H.), the development of 
the coal-tar colour industry since 1882, 
775. 
*Perkin (Prof. W. H., jun.) on the con- 
stitution of the alkaloid, berberin, 785. 
Perry (Prof. J.) on standards for use in 
electrical measurements, 95; on the 
earthquake and volcanic phenomena 
of Japan, 160. 
Perry (Prof. 5. J.) on the best means of 
comparing and reducing magnetic ob- 
servations, 172. 
Persia, new trade routes into, by H. F. B. 
Lynch, 889. 
——, Northern, and Asia Minor, the 
nomad tribes of, report on, and on ex- 
excavating on sites of ancient occupa- 
tion, 535. 
——, Southern, a railway through, by 
Major-Gen. Sir F. J. Goldsmid, 888. 
*Pettersson (Dr. O.) on recent Swedish 
investigations on the gases held in 
solution by the sea-water of the Ska- 
gerack, 779. 
*Pfafl’s problem, the history of, A. R. 
Forsyth on, 743. 
Phené (Dr.) on an unidentified people 
occupying parts of Britain in pre- 
Roman-British times, 974. 
Phenological phenomena, the arrange- 
ments for recording, G. J. Symons on, 
868. 
Phillips’s Dyke, Ingleton, T. Tate on, 814. 
*Phosphorous oxide, Prof. T. E. Thorpe 
on, 780. 
Phosphorus trichloride, the action of, on 
organic acids and on water, by C. H. 
Bothamley and G. R. Thompson, 784. 
Photographs, instantaneous, of water 
jets, by Lord Rayleigh, 752. 
Photographs, recent, of the less refran- 
gible portions of solar spectrum under 
different atmospheric conditions, by G. 
Higgs, 760. 
*Photographs of clouds, exhibition of, by 
Friese Greene, 751. 
Photographs of geological interest in the 
United Kingdom, report on the collec- 
