356 
Soda granite, xiv., 204 
Microscopic characters of, xiv., 205 
analyses of, xiv., 207 
production of, v., 192, 193 
Sodalite, viii., 162 
from three new localities, xili., 139 
Sodium, v., 179, 186, 187, 193, 214, 
215 
in comet, v., 254 
nitrate of, v., 214 
peroxide of, v., 214, 215 
sulphato-chloride, viii., 9 
Soil, exhaustion by sugar-cane, lii., 
15, 16 
exhaustion in America, 11i., 16-17 
Solanacex, vii., 12 
Solanum eleagrifolium, vii., 12; ix., 
185 
rostratum, ix., 185 
Torrey?, ix., 185 
triquetrum, ix., 185 
Solar and terrestrial activity, xii. , 26 
eclipse of October 20, 1892, xii., 26; 
of 1889, viii., 153-156 
Facule in Rutherford’s photo- 
graphs, xiii., 205 
parallax, v., 238, 239 
prominences, v., 244, 245 
spectrum, v., 242-244, 245 
system, evolution of, v., 249 
physics, viii., 14; the bearing of 
electrical discharges on, xii., 48, 
49 
spectrum, researches on, xi., 125 
“Soldier termites,’’ viii., 90-95; 104— 
111 
Solidago sarothre, vii., 10 
lateriflora, ix., 11 
nana, Vili., 80 
Solidification of fluids, v., 191 
Sombrero Island, dust columns at, 
TV ep 
Some of the sources of Burger’s 
Lenore, xv., 271 
Sonchus asper, ix., 181 
Sonometer, organ-pipe, i., 163 
Sonorous sands, ii., 147, 148; viii., 9, 
10, 182, 183 
in America and Scotland, iii., 72- 
76 
microscopic examination of, 1ii., 75 
of Egypt, ix., 123 
cause of, ix., 24 
researches on, ix., 21, 123 
INDEX. 
Sophora affinis, ix., 184 
secundiflora, vii., 9 
Sorghum, v., 194 
industry, 1il., 5, 6 
Sotol whiskey of Chihuahua, ii., 93, 
94 
Sound, diffraction of, viii., 130, 131 
Sounds in nature, origin of, iii., 75 
on beach of Costa Rica, iii., 76 
Sound shadows, viii., 131 
waves, viii., 130, 131; theory of, 
iv., 34 
Seuth Africa, crocidolite, iii., 104 
America, journey in, vi., 129, 138, 
147 
American fishes, xiii, 110; Indian, 
head of, xi., 26 
.Carolina, phosphate beds, yield of, 
1K 80 
Southern Egypt, 1i., 116 
Spangled mica-schist, viii., 49 
Spanish chestnuts, exhibition of, xi., 
13 
explorers, vi., 60-65 
Special committees, reports of, ix., 
4, 37, 70, 109 
Specializations of sex in insects, iii., 
103 
Species of band b ( Protolenus Fauna), 
list of, xiv., 148 
of Scirpus and Rhynchospora, Xi., 
74 
Specific gravity of amber, ii., 85 
Specimens, collecting, x., 83 
Spectra of comets, v., 254 
of stars, v., 259 
of sun, v., 242-244 
of sun-spots, v., 242 
Spectroscopy, vili., 14, 155 
Spectrum of Gould’s comet, ii., 20 
Spermatogenesis of Lumbricus Archo- 
plasm mass in, xiii., 135 
Spermophilus Beldingi, viii., 41 
Spermophila parva, uv. sp., ii., 151 
Sperrylite, viii., 56 
Spessartite, vili., 153, 161 
from Col., v., 213 
Spheralcea, vili., 77 
Emoryi, viii., 79 
hastulata, vii., 8 
pedatifida, vii., 8 
Spazria, v., 115 
Spheriacei, v., 114 
Sphalerite, iii., 23, 49; vili., 17 
