of birds, the, 340.

of butterflies, 354.

Floods in Southern France, 98.
Flora of Guadalupe, ccxix.
Floras, modern and tertiary, 361.
Florida, climatology of, 117.

new serpent from, 342.

Flower, Prof., 582.

of oyster-culture, 420.

prizes for American fish, 426.

Frenzel, Mr., xcviii., 244.

Frerichs, Mr., cxli., 319.
Fresenius, Mr., ccxc.
Fresnel's formula, 139.
Freund, Mr., lxxxv.
Friedel, Mr., lxxvi.

Fries, Prof. Theodore, ccxvi.
Fritsch, Dr., SS, 368.

Fritsche's travels in China, 297.
Fritz, Prof., xxxv., 26, 116.

Frog-eggs and electric currents, 316.
Froment, Mr., xlix.

color of, 376.

Fluorescence and absorption, 170.

Fog-signal by gas gun, 129.

efficiency of, 180, 181.

Fruit-trees, best shape for, 392.

Fuhg, Mr., XXV.

Fundula cyprinodonta, 425.

Fungus, hollyhock, 376.

on orange and olive trees, ccxi.

Furnace for puddling iron, revolving,

462.

Furnace-bars, revolving, 484.

-slag, utilizing, 460.

Fur-seal of the Pacific, ccxxvii.
Fuses, electric, 488.

Galilee, Lake of, 64.
Galippe, Dr., 568.
Galle, Dr., xxv., 44.

Gallium, a new element, 223.
Galton, Mr. Francis, clxxi.
Galvanic arch, influence of a magnet upon,
166.

currents, heat by, 126.
Galvanism acting on medicines, 561.
Galvanometer, new absolute, 162.
Gamond, Mr. Thomé de, cclv.
Gannett, Mr. Henry, 272.
Garbich, Mr., 201.

Gardner, Mr. James T., 277, 302, 574.
Garibaldi, General, ccli.
Gariel, Mr., lxi.

Garman, Mr. S. W., 342.
Garrod, Prof., 582.

Gas analysis, cclxxxiii.

flames form sulphates, 228.
for light-houses, 441.

fuel, cclxvii.

gun for fog-signals, 129.

price of, 442.

Gas-lamp for laboratories, universal, 553.
-wells of Pennsylvania, 247.

Gases and liquids, molecular constitution
of, 127.

Geikie, Prof., 331, 588.

305.

Physics, 119.

Summary, xix.

Generalization in ocean physics, new,72.

Genin, Mr., 320.

Gensoul, Mr., 547.

Genth, Dr., xcvii., xcviii.

Geodesy in Switzerland, 251.

navigation cxiv.

and hydrography,

Geodetic triangulations, arrangement of,

250.

Geographical distribution of auroras,

26.

Geography, cxiv., 249.

Geology, xcix.

and mineralogy, 235. microscope in, cxlii.

of publications, 587.

of Costa Rica, 241.

George, Mr., ccvii.

Gerard, Mr., cclxxxvi., 541.

Gerbe, Mr., clxxxi., clxxxvi., cxcviii.
Gerber, Mr., xciii.

German Nautical Observatory, 30.
Germany, petroleum springs in, 240.
Germination of seeds, assisting, 364.
Gernez, Mr., lvi.

Gervais, Prof., 342, 343, 347, 356.
Giant kettles, or pot-holes, 235.

Giard, Mr., clxxviii., clxxx., clxxxv.

Gibb, Sir Duncan, clxxii.

Gibbs, Mr. Wolcott, lxviii.

Gibraltar, tunnel under Strait of, cclvii.

Giessler, Dr., 160.

Gigantic marine worm, 352.

Gilbert, Dr., 400.

Mr. G. K., 287.

Gilding glass, 535.

Gill, Prof. Theodore, cc., cxxv., 348.

Rev. Wyatt, clxix., clxx.

Gillmore, Lieut.-Colonel Q. A., 490.
Gilman, Mr. Henry, clii., clx.

Gilt-glass prism in the camera lucida, 144.

Gintl, Dr., 471.

Gioberti-tincture, 516.

Girard, Mr., lxxxix., 123.

iodine, 528.

Hamilton's equation of motion, 4. Hammerbacher, Mr., lxxxi. Hammerschmidt, Dr., 333.

425, 585.

Grenacher, Mr., clxxxii.

Grimm, Prof. Oscar, 351.

Griffin, Mr., lxxx.

Gross, Mr., 372.

Mr., cxcv.

Grote, Dr. A. R., 389.

Ground currents and the aurora, 27. telegraphic, 197.

Groundwort as a febrifuge, 560. Growth of oysters in France, 439. of the vegetable cell, ccxiv. Grüneberg & Vorster, Messrs., 540. Gruner, Mr., cclxiv.

Guano and menhaden oil, 417.
artificial, 381.

continued supply of, 380.
deposits in Peru, new, 382.
from dried fish, etc., 384.

Guhrauer, Dr., 540.
Guillemin, Mr., 47, 48.
Gulliver, Prof., cxl.

Gum tragacanth, 225.

Gun-cotton, 479.

for fog-signal, 130.

Gundersen, Capt., exxiii.

Mr E. T., clviii.

Hanbury, Daniel, 593.
Haner, General, cxv.

Hann, Mr., xxxviii., xxxix.
Hansen, Mr., 513.

Hansen's manuscripts, 589.

Harbor of New York, 252.

Harbors and roadsteads, preservation of,

496.

Hardening sandstone, 464, 520.
Harding, Mr. G. E., ccliii.
Hardman, Mr., cviii.
Hardwicke, Robert, 593.

Hargreave's improvements, cclxxx.
Harkness, Prof. William, 57.

Harmony in musical instruments, 204.

Harpyopsis novæ guineæ, cxxxiii.
Harrison, Mr. P., 15.

Hartig, Mr., ccxiv.

Hartley, Mr., lxxxi.

Mr. W. N., 209.

Hartmann, Mr., xci.

Hartshorne, Mr. Bertram, clxviii.

Hartt, Mr. Chas. Fred., A.M., clxvi.
Prof., clv., clxxiii.

Harvard College Observatory, xx.

sions of, 479.

Gunther, Dr., 64, 342.

Mr., 574.

Guppy, Mr., clxxxiii.

Gurney, Sir Goldsworthy, 593.

Guthe, Hermann, 593.

Guthrie, Mr., lv.

Mr. Frederick, 214

Prof., 119, 162, 194, 212.

Gutzeit, Mr., lxxxiv.

Gylden, Prof., xxvii., xxx., 43. Gynandrophormism, cxciií.

Heat, liii.

and electricity, 125.

and products of gunpowder explosions, 479.

and vegetation, 367, 368.

by galvanic currents, 126.
repulsion due to, 155.

Hector, Dr., ccv., 359, 360.
Heeren, Prof., 537.

Heinzmann, Dr., 249.

Helicops alleni, 342.

Hell and Medinger, Messrs., lxxxviii.
Mr., 31.

Hell-Gate passage, ccxlv.

Hellriegel, Mr., 402.

Hellwald, Fr. von, cliii., clxiii.

Helmert, Prof., xxxii., 29.

Helmholtz, Prof., lii., 130.

Henderson hydraulic brake, ccxxxix.
Hendricks, Prof. J. E., Ixx.
Hennessey, Mr., 11.

Hirn's mega-barometer, xxxvii.

Hoberlandt, Mr., 364.

Hybridization of salamanders, 342.

Hydrate of carbon, 214.

Hydraulics of the Adirondack plateau, 478.

Hydrocarbons, purification of, 526.

Hoeck, Mr., 48.

Hoffman, Mr., cclxxiv.

Hofmann, Dr., cclxxxii., 217, 457.

Mr., lxxxvi., 368.

Hog, evolutions of the, 334.

Holden, Mr., xxviii., xxxii.

Prof., xxvii., 20.

Holley, Prof. A. L., 489.

Hollis, Dr., cxlviii.

Hollyhock fungus, 376.

Holmes and Jackson, Messrs., clii., clvi.

Mr., 265, 267, 269, 563.

Prof., 151.

Holtz, Mr., 124, 575.

Honey, secretion of, 316.

Hooker, Dr., 363.

Hoorweg, Mr., lviii.

Hopkins, Mr., 128.

Hopkinson, Dr., 145, 469.

Horizontal pendulum, Zöllner's, 174.

Hornaday, Mr., ccii.

Horrebow, Mr., 31.

Horse-hair, dyeing, 527.

-pox, 390.

Horsford, Mr., xci.

Hot baths, uses of, 561.

Hotz-Osterwald, Mr., 516.
Hough, Dr. F. B., 377.

Prof. G. W., 85, 112.

Houzeau, Mr., 321.
Howard, Messrs., 3.

Mr., xcii.

and iron, a brittle alloy, 218.
peroxide of, 230.

Hydrogenium, physical properties of, 209.

Hydrogenized iron, 217.

Hynes, Prof., cliii.

Hypsometry, barometric, 254.

in California, 303.