GENERAL INDEX 
Spider, fossil, Prof. F. Romer on a, lately 
discovered in the Coal-Measures of 
Upper Silesia, 1865, 73 
Spiders, Tuffen West on some points of 
interest in the structure and habits of, 
1861, 162 
-Richard Beck on the spinnerets of, 
1864, 88 
*■-trap-door, from Corfu, R. F. Wright 
on some, 1864, 101 
Spiller (John) on the preservation of 
stone, 1867, 44 ; on certain new pro¬ 
cesses in photography, 45 
- analysis of the Roman mortar of 
Burgh Castle, Suffolk, 1868, 43 
--- on the discrimination of fibres in 
mixed fabrics, 1870, 64 
--on artificial magnetite, 1873, 66 
-- 011 the identification of the coal-tar 
colours, 1880, 542 
-description of some new crystallised 
combinations of copper, zinc, and iron 
sulphates, 1885, 976 
—— the composition of the ancient 
Roman mortar from the London Wall, 
1888, 637 
* - on the best method of establishing 
international standards for the analysis 
of iron and steel , 1889, 50 ; 1890, 262 
-an experiment in colour-blindness, 
1889, 518 
*Spine, curvature of the, in the foetus 
and the child, Dr. J. Symington on the, 
1885, 1101 
^Spinning purposes, cards for, D. Bate¬ 
man on the manufacture of, 1875, 210 
Sjriranthes Pomanzoviana, Cham., A. G. 
More on, 1871, 129 
* -Dr. D. Moore on, 1875, 158 
^'Spirit-levels, chambered, T. Warner on, 
1869, 54 
*Spirogyra, the division and conjugation 
of, Dr. J. M. Macfarlane on, 1885, 108 S 
Spirometer, a new, W. F. Stanley on, 
1890, 982 
Spitzbergen, Mr. Leigh Smith’s voyages 
to, Lieut. H. Chermside on, 1874, 171 
- current, Colonel Shaffner on the, 
1861, 198 
*Sponge, the Portuguese anchor-, Dr. 
J. E. Gray on, 1870, 117 
- deep-sea, W. R. Hughes on the 
development of a, 1865, 86 
* -from the Norwegian coast, simu¬ 
lating a liydroid polyp, W. J. Sollas 
on a, 1879, 377 
* - possessing tetragonal symmetry, 
Prof. W. J. Sollas on a, 1886, 710 
-- spicules from the Chalk of Trim- 
mingham, Norfolk, Prof. W. J. Sollas 
on, 1880, 586 
^'Sponges, the affinities of the, to the 
corals, W. S. Kent on, 1870, 120 
* - from the Carboniferous Limestone 
000 
oy.j 
near Glasgow, J. Young on siliceous, 
1876, 99 
Sponges constituting the family Dictyo- 
spongidge, Prof. J. Hall on the} fossil 
reticulate, 1884, 725 
-—— the nervous system of, Dr. R. von 
Lendenfeld on, 1886, 710 
* - as a source of bromine and of 
nitrogen, Dr. Phipson on, 1865, 34 
^'Spontaneous combustion of coals in 
ships, J. Bamfield on the, 1880, 696 
-- generation, F. Crace-Calvert on,. 
1871, 123 
* - generation from a chemical point 
of view, Prof. Debus on, 1874, 57 
- generation, the controversy on, J. 
Samuelson on, with new experiments, 
1870, 133 
* -generation and the germ theory, N._ 
Carmichael on, 1876, 146 
Sporangia of ferns from the Coal-measures,. 
W. Carruthers on the, 1870, 71 
Spottiswoode (William) on Petzval’s 
asymptotic method of solving differen¬ 
tial equations, 1861, 10 ; on the reduc¬ 
tion of the decadic binary quantic to 
its canonical form, 11 
-on the Hindu method of calculating 
eclipses, 1862, 18 
-Address to the Section of Mathe¬ 
matics and Physical Science, 1865, 1 
* -on musical intervals, 1870, 15 
- on instruction in elementary geometry , 
1873, 459 ; 1876, 8 
-- on science lectures and organisation , 
1873, 495 , 507 
* -on triple tangent planes, 1873, 24 
-- on preparing and printing tables of 
wave-numbers, 1874, 241 
* - on multiple contact of quadrics : 
and other surfaces, 1874, 19 
- on mathematical notation and print¬ 
ing, 1875, 337 
- Presidential Address at Dublin 7 
1878, 1 
-- on the oscillation-freeguencies of solar 
rays, 1878, 37 
■-- on the eighteen co-ordinates of a 
conic in space, 1878, 462 
— on the progress of the chief branches • 
of mathematics and physics, 1879, 37 
* -on the polar planes of a point with 
respect to four quadric surfaces, 1881,. 
547 
Spottiswoode’s triple combination of 
double-image prisms and quartz plates, 
a form of, applied to the table polari- 
scope, S. C. Tisley on, 1874, 26 
Sprague (F. J.), demands of a system 
of electrical distribution, 1882, 448 
* - (T. B.), explanations of Mr. 
McClintock’s method of finding the 
value of life annuities by means of the 
gamma function, 1874, 19 ; *on the 
