GENERAL INDEX. 
333 
Powder, Capt. Wynants on barytic, for 
heavy ordnance, 1866, 148 
Powell (G. Baden) on the appro¬ 
priation of 7Vages and other sources of 
■income, 1882, 297 
-on the revenue from the taxation of 
alcohol, 1882, 636 
-(Major J. W.) on the classification 
of North American languages, 1884, 
899 ; marriage laws of the North 
American tribes, 911 
-telegraphic despatch from, relative 
to the recent earthquake in the United 
States, 1886, 656 
-(W.), six years’ exploration in New 
Britain and neighbouring islands, 
1880, 658 
Power (J B.) on the execretion of 
nitrogen: Part II., By the skin, 1878, 
602 
Power-couplings for rolling-mills and 
other machinery, F. H. Yarley and E. 
Furness on, 1874, 231 
*Power looms, J. K. Caird on an iron 
carnb for, 1867, 153 
Towers of circles and spheres, some 
geometrical theorems relating to the. 
Prof. W. W. Johnson on, 1890, 743 
Poynting (Prof. J. H.) on a differential 
gravity meter , 1885, 141 ; 1887, 41 ; 
1888, 72 
—— on the proof by Cavendish’s 
method that electric action varies in¬ 
versely as the square of the distance, 
1886, 523 
- on electrolysis in its physical and 
chemical hearings, 1886, 308 ; 1887, 
336 ; 1888, 339 1889, 223 ; 1890,138 
-- on the desirability of introducing a 
uniform nomenclature for the funda¬ 
mental units of mechanics, 1888, 27 
-and E. F. J. Love on the law of 
the propagation of light, 1886, 521 
* Prairie Indians, \V. Hepworth Dixon on 
the great prairies and, 1868, 134 
Prairies, It. Brown on the formation of, 
1868,134 
Trail's system of central station heating 
and power supply, W. W. Phipson on, 
1889, 749 
Prance (C. C.) on depreciation of land as 
caused by recent legislation, 1887, 835 
Pratt (J. J.) on the colony of New 
Scotland in Southern Africa, 1867, 128 
Pre-Cambrian (Laurentian) island of 
St. David’s, Pembrokeshire, J. \V. 
Salter on the, 1864, 67 
-igneous rocks of St. David’s, Prof. 
J. F. Blake on the, 1883, 507 
--- rocks, classification of, the British, 
Dr. H. Hicks on the, 1879, 351 
-- rocks of Canada, first impressions 
of some, Prof. J. F. Blake on, 1884, 
728 
Pre-Cambrian rocks of Central England,. 
Dr. Harvey B. Holl on the, 1865, 59 
- rocks in the Harlech Mountains, 
Merionethshire, Dr. H. Hicks on the, 
1880, 584 
-rocks in North Wales, some new 
areas of, Dr. H. Hicks on, 1878, 536 
-—- rocks occurring as fragments in the 
Cambrian conglomerates in Britain, 
Dr. H. Hicks on, 1890, 803 
Precession and nutation, Prof. Zenger 
on the nutoscope, an apparatus for 
showing graphically the curve of, 
1871, 36 
-of a viscous spheroid, G. H. Darwin 
on the, 1878, 482 
Precessional motion of a liquid, Sir W. 
Thomson on the, 1876, 33 
Precious metals, the amount of the, in use 
as money in the principal countries, 
the chief forms in which the money is 
employed , and the amount annually 
used' in the arts, report as to the 
statistical data available for 
determining, 1888, 219 ; 1889, 164 ; 
1890,498; memorandum, by Prof.F. 
Y. Edgeworth, on Jevons' method of 
ascertaining the number of coins in 
circulation, 1888, 224 
- stones and metals in India, the 
mode of occurrence of, V. Ball on, 
1884, 731 
Pre-Cymric epoch in Wales, Hyde 
Clarke on the, 1880, 629 
Predatory races of Asia and Europe, 
C. S. Wake on the, 1875, 179 
Preece (W. H.) on the telephone, 1877, 34 
*-- on recent improvements in 
telegraphic apparatus, 1878, 697 
- on lightning protectors for tele¬ 
graphic apparatus, 1879, 259 
--on a peculiar behaviour of copper, 
1880, 470 ; on the proper form of 
lightning conductors, ib. 
- on standards for use in electrical 
measurements, 1881, 423 ; 1882, 70 ; 
1883, 41 ; 1884, 29 ; 1885, 31 ; 1886, 
145 ; 1887, 206 ; 1888, 55 ; 1889, 41 ; 
1890, 95 
- on the application of electricity to 
the localisation of a bullet in a 
wound, 1881, 531 ; *on a screw-gauge 
for electrical apparatus, 779 
- on fixing a standard of white light, 
1882, 38 ; 1883, 127 ; 1885, 61 ; 1886, 
39 ; 1887, 47 ; 1888, 39 
- on a new hand dynamo-machine, 
1882, 447 : on recent progress in tele¬ 
phony, 666 ; on a new arc lamp, 667 
- on the determination of a gauge for 
the manufacture of various small screws, 
1882, 311 ; 1883, 318 ; 1884, 287 
--on telegraphic intercommunication, 
1883 , 650 
