GENERAL INDEX 
319 
Perkin (Prof. W. H., jun.) and Dr. J. 
B. Cohen, some new cinnamic acids, 
1887, 667 
Perkins (C. H.) on the anthracite coal 
and coalfield of South Wales , 1883, 
220 
* -(L.) on Perkins’s high-pressure 
engine, 1877, 217 
* - (W.) exploration of the Grand 
Chaco in La Plata, with an account of 
the Indians, 1867, 127 
Permanent nay , American , J. M. Wilson 
on, 1884, 593 
Permian breccias of the country near 
Whitehaven, R. Russell on the, 1874, 92 
-fauna of Bohemia, Prof. A. Fritsch 
on the, 1887, 716 
* -formation of Texas, Prof. E. D. Cope 
on the Vertebrata of the, 1878, 571 
-group of the N.W. of England, Sir 
R. I. Murchison and Prof. R. Hark- 
ness upon the, 1863, 83 
-rocks of the lower portion of the 
vale of Eden, Cumberland, Prof. Hark- 
ness on the occurrence of faults in 
the, 1873, 81 
«■-rocks of Westmoreland and Dur¬ 
ham, Sir R. I. Murchison on the 
occurrence of the same fossil plants 
in the, 1864, 59 
- Dyas versus, Rev. A. Irving on, 
1883, 503 
Peronospora, on the structure of the 
nuclei in, and on their behaviour 
during the formation of the oosphere, 
H. W. T. Wager on, 1889, 618 
Peroxide of hydrogen, T. Fairley on 
chlorine, hypochlorous acid, &c., and, 
1874, 57 
tPERROT (Major Sir H.), a note on Hough¬ 
ton, the African traveller, 1887, 803 
Perry (Jas.) on the surface rocks of 
Syria (suggested by the quarries at 
Baalbek), 1879, 348 " 
-(Prof. J.) on devising and construct¬ 
ing an improved form of high insula¬ 
tion hey for electrometer norh , 1880, 
29 ; on accurately measuring the specific 
inductive capacity of a good Sprengel 
vacuum, and the specific resistance of 
gases at different pressures, 197 
- on experiments to determine the 
thermal conductivities of certain rochs, 
1881, 126 
- on standards for use in electrical 
measurements, 1881, 423 : 1882, 7 °j 
1883, 41 ; 1884, 29 ; 1885, 31 ; 1886, 
145 ; 1887, 206 ; 1888, 55 ; 1889, 41 ; 
1890, 95 
- on the desirability of combined 
action for the translation of foreign 
memoirs, 1887, 41 ; on the development 
of graphic methods in mechanical 
science, 1889, 322 
Perry (Prof. J.) on a variable standard 
of self-induction, 1889, 512 ; on hot 
twisted strip voltmeter, ib. 
■ - on the earthquake and volcanic phe¬ 
nomena of Japan, 1890, 160 
* -and W. E. Ayrton on the contact 
theory of voltaic action, 1876, 42 ; 
_ *1877, 33 
* -and W. E. Ayrton on the viscosity 
of dielectrics, 1877, 33 
-and Prof. W. E. Ayrton, a new 
determination of the number of elec¬ 
trostatic units in the electromagnetic 
unit, 1878, 487 ; on the electrical pro¬ 
perties of bees’ wax and lead chloride, 
497 
-and Prof. W. E. Ayrton on a dyna¬ 
mometer coupling, 1881, 553 
* -and Profs. Sir W. Thomson and 
Ayrton, electrometric determination 
of ‘ v,' 1888, 616 
-(Rev. S. J.) on the transit of Venus, 
Dec. 8 , 1874, 1875, 24 
-Nos Vey and the South-west of 
Madagascar, 1883, 595 
-on the spot spectrum from D to B, 
1884, 635 
- on comparing and reducing magnetic 
observations, 1885, 65 , 89 ; 1886, 64 , 75 ; 
1887, 320 ; 1888, 28 ; 1889, 49 ; 1890, 172 
Persia, Central, and the sea, the various 
means of communication between, 
Lieut.-Colonel J. W. B. Champain on, 
1882, 628 
-and Central Asia, the deserts of, the 
physical geography of, W. T. Blanford 
on, 1873, 162 
-Eastern, Colonel F. J. Goldsmid on, 
1866, no 
-fauna of, W. T. Blanford on the, 
1873, no 
■ - Northern, and Asia Minor, the nomad 
tribes of, report on, and on excavating 
on sites of ancient occupation, 1890, 535 
-Northern, roads in, and on the 
Russio-Persian frontier, Lieut. Gill on 
some, 1874, 182 
-Southern, a railway through, Major- 
General SirF. J. Goldsmid on, 1890, 888 
-the pre-Turkish frontagers of, H. H. 
Howorth on, 1870, 151 
-recent travel in, Col. Sir F. J. Gold¬ 
smid on, 1873, 171 
* - trade routes in, Major St. John on, 
1873, 173 
-trade routes into, H. F. B. Lynch 
on new, 1890, 889 
* -the Turcoman frontier of, Captain 
the Hon. G. Napier on, 1875, 195 
-unexplored or little known parts of, 
Col. Sir O. St. John on some, 1882, 628 
* Persian Gulf, Lieut.-Col. L. Pelly on the 
tribes, trade, and resources around the 
shore-line of the, 1863, 143 
