pigeons, 39.

Colymbetes, 429.

Compensation of growth, 158.
Compositæ, flowers and seeds of, 157.

-, outer and inner florets of, 225.
male flowers of, 491.
Conclusion, general, 519.
Conditions, slight changes in, favour-
able to fertility, 317.
Convergence of genera, 139.
Coot, 189.

Cope, Prof., on the acceleration or
retardation of the period of repro-
duction, 197.

Coral-islands, seeds drifted to, 406.
reefs, indicating movements of
earth, 406.
Corn-crake, 190..

Correlated variation in domestic
productions, 29.
Coryanthes, 203.

Creation, single centres of, 400.
Crinum, 302.

Croll, Mr., on subaerial denudation,

oaks, 67.

on low plants, widely dis-
persed, 446.

on widely-ranging plants being
variable, 69.

-, on naturalisation, 125.
-, on winged seeds, 158.

on Alpine species suddenly be-
coming rare, 180.

-, on distribution of plants with
large seeds, 407.

on vegetation of Australia,
423, 424.

on fresh-water plants, 430.
on insular plants, 432.
Degradation of rocks, 336.
Denudation, rate of, 337.

of oldest rocks, 360.
of granitic areas, 345.
Development of ancient forms, 384.
Devonian system, 382.

Dianthus, fertility of crosses, 306,

eating seeds, 408, 430.

fresh-water, distribution of,
427, 428.

Fishes, ganoid, now confined to
fresh water, 118.

-

372.

electric organs of, 198.

ganoid, living in fresh water,

of southern hemisphere, 421.
Flat-fish, their structure, 240.
Flight, powers of, how acquired,
186, 187.

Flint-tools, proving antiquity of
man, 35.

Flower, Prof., on the larynx, 246.
on Halitherium, 378.

on the resemblance between
the jaws of the dog and Thylaci-
nus, 464.

on the homology of the feet
of certain marsupials, 473.
Flowers, structure of, in relation to
crossing, 106.

of compositæ and umbelliferæ,
157, 225.

beauty of, 211.

double, 292.

Flysch formation, destitute of or-
ganic remains, 341.

Forbes, Mr. D., on glacial action in
the Andes, 418.

E., on colours of shells, 146.
on abrupt range of shells in
depth, 181.

on poorness of paleontological
collections, 340.

on continuous succession of
genera, 367.

405.

on continental extensions, 404,

on distribution during Glacial
period, 412.

on parallelism in time and
space, 448.

434.

birds

of,

productions of, 439, 440.
Galaxias, its wide range, 427.

Galeopithecus, 185.

Game, increase of, checked by ver-
min, 84.

Gärtner, on sterility of hybrids, 299,
300, 305.

on reciprocal crosses, 308.

-, on crossed maize and verbas-
cum, 325.

-, on comparison of hybrids and
mongrels, 327, 328.

Gaudry, Prof., on intermediate gen-
era of fossil mammals in Attica,
378.

Geese, fertility when crossed, 304.
upland, 189.

Geikie, Mr., on subaerial denuda-
tion, 336.

Genealogy, important in classifica-
tion, 457.

Generations, alternate, 478.

Geoffroy St. Hilaire, on balance-
ment, 158.

on homologous organs, 473.
Isidore, on variability of re-
peated parts, 160.

on correlation, in monstrosi-
ties, 29.

on correlation, 156.

on variable parts being often
monstrous, 165.
Geographical distribution, 395.
Geology, future progress of, 527.
imperfection of the record,

527.

545

Glands, mammary, 244.

Gmelin, on distribution, 412.
Godwin-Austen, Mr., on the Malay
Archipelago, 352.

Goethe, on compensation of growth,
158.

Gomphia, 227.

Gooseberry, grafts of, 311.

Gould, Dr. Aug. A., on land-shells,
438.

Mr., on colours of birds, 146.
on instincts of cuckoo, 273.
on distribution of genera of
birds, 445.

Gourds, crossed, 325.

Graba, on the Uria lacrymas, 105.
Grafting, capacity of, 310, 311.
Granite, areas of denuded, 345.
Grasses, varieties of, 124.

Gray, Dr. Asa, on the variability of
oaks, 66.

on man not causing variabil-
ity, 93.

on sexes of the holly, 107.
-, on trees of the United States,
113.

on naturalised plants in the
United States, 125.

-, on æstivation, 226.
-, on Alpine plants, 412.

on rarity of intermediate va-
rieties, 182.

Dr. J. E., on striped mule,

171.
Grebe, 189.

492.

on the limbs of Lepidosiren,