262 
GENERAL INDEX. 
Magellan, Strait of, Dr. E. 0. Cunning¬ 
ham on the flora of the, 1869, 112 
-Straits of, and the passages leading 
northward to the Gulf of Penas, Capt. 
R. C. Mayne on the, 1869, 164 
...■ — the terrestrial and marine fauna of, 
Dr. R. 0. Cunningham on, 1870, 114 
Magnesia, pyrophosphate of, Dugald 
Campbell on the action of nitric acid 
upon, 1862, 37 
-the effects of, on vegetation, Maj.- 
Gen. Scott on, 1880, 550 
Magnesium lamp, H. Larkin on a, 1866, 
40 
-manganite of, W. Weldon on the 
manufacture of chlorine by means of, 
1872, 86 
* - and potassium chlorate, the ex¬ 
plosive character of a mixture of, P. 
Braham on, 1877, 51 
Magnetic compass, a gyrostatic working 
model of a, Prof. Sir Wm. Thomson on, 
1884, 625 
- declination and horizontal force, 
Sabine's method of reduction of hourly 
observations of, examples of the applica¬ 
tion of a modified form of to single 
quarter's registrations of the magneto- 
graphs at the Colaba Observatory, 
Bombay , by C. Chambers, 1886, 84 
-dip and declination, Prof. Henness } 7 
on a probable cause of the diurnal 
variation of, 1861, 39 
— distribution, H. A. Rowland on, 
1875, 29 
- disturbance, Senhor Capello on, 
1866, 13 
-disturbance of Feb. 20-25, 1866, 
Senhor Capello on a comparison of the 
Kew and Lisbon curves during the, 
1867, 20 
-disturbance, the general coincidence 
between sun-spot activity and terres¬ 
trial, Rev. F. Howlett on, 1881, 541 
disturbances and earth-currents, 
Prof. W. G. Adams on, 1881, 463 
- declination disturbances and mind 
values at Kern, comparison of, 1888, 28 
- disturbances at Port Bae in 1882- 
83, Major H. P. Damson on, 1888, 31 
* -disturbances, regional, in the 
United Kingdom, Profs. A. W. Rucker 
and T. E. Thorpe on, 1890, 751 
-double circular refraction, Dr. De 
W. B. Brace on, 1885, 931 
--effect of the sun or moon on instru¬ 
ments at the earth’s surface, G. John¬ 
stone Stoney on the amount of the 
direct, 1861, 47 
--equator in the Gulf of Siam and in 
the Gulf of Bengal, Dr. J. Janssen on 
the position of the, 1875, 28 
.- experiment, W. H. Preece on a, 
1886, 546 
Magnetic field, the earth’s, the measure¬ 
ment of the intensity of the horizontal 
component of, T. Gray on, 1885, 898 
-figures, new, Prof. S. P. Thompson 
on, 1878, 450 
- force, the supposed connection 
between meteorological phenomena 
and the variations of the earth’s, 
John Allan Broun on, 1861, 49 
-force, terrestrial, the laws of the 
principal inequalities, solar and lunar, 
of, the Astronomer Royal, G. B. Airv, 
on, 1861, 36 
- force, the vertical, at Bombay, luni- 
solar variation of, C. Chambers on, 
1887, 334 
—— hysteresis, Prof. G. Forbes on, 1886, 
550 " 
- induction and electricity, J. B. 
Thompson on the mechanical theory 
and application of the laws of, 1864, 15 
--induction as affecting observations 
of the intensity of the horizontal com¬ 
ponent of the earth’s magnetic force, 
C. Chambers on, 1877, 33 
--- induction inclinometer adapted for 
photographic registration, C. Carpmael 
on an, 1884, 635 
■\ - metals, iron, nickel, and cobalt, 
W. F. Barrett on the relationship of 
the, 1873, 40 
-metals, the alteration in the di¬ 
mensions of the, by the act of mag¬ 
netisation, Prof. W. F. Barrett on, 
1882, 476 
-meter, exhibition and description 
of Miller’s portable torsion, by Prof. 
J. Blyth, 1886, 556 
- observations, report of the Committee 
for considering the best means of com- 
paring and reducing, 1885, 65 ; 1886, 
64 ; 1887, 320 ; 1888, 28 ; 1889, 49 ; 
1890, 172 ; results of a comparison be¬ 
tween the mind values and declination 
disturbances at the Kern Observatory , 
by Prof. Balfour Stewart and W. L. 
Carpenter, 1888, 28 ; magnetic disturb¬ 
ances at Fort Bae in 1882-83, Major 
H. P. Damson on, 31 
- observatories, preliminary list of, by 
Gen. Sir J. H. Lefroy and G. M. 
Whipple, 1887, 327 
- observatory at Tifiis, report on the 
proposed establishment of a, by General 
Saline, 1865, 313 
-paradox, S. A. Varley on a, 1870, 27 
--- permeability of an iron bar, the 
influence of a plane of transverse sec¬ 
tion on the, Prof. J. A. Ewing and W. 
Low on, 1887, 609 
- power, the maximum amount of, 
which can be developed by a given 
galvanic battery, TI. Highton on, 1870, 
2 s 
