cial action in the Andes

Forbes, E., on colours of shells
--on abrupt range of shells in depth
--on poorness of palaeontological collections
--on continuous succession of genera
--on continental extensions
--on distribution during Glacial period
--on parallelism in time and space

Forests, changes in, in America

Formation, Devonian
--Cambrian
--intermittent
--thickness of, in Britain

Formica
--rufescens
--sanguinea
--flava, neuter of

Forms, lowly organised, long enduring

Frena, ovigerous, of cirripedes

Fresh-water productions, dispersal of

Fries on species in large genera being closely allied to other species

Frigate-bird

Frogs on islands

Fruit-trees, gradual improvement of
--in United States
--varieties of, acclimatised in United States

Fuci, crossed

Fur, thicker in cold climates

Furze

Galapagos Archipelago, birds of
--productions of

Galaxias, its wide range

Galeopithecus

Game, increase of, checked by vermin

Gartner on sterility of hybrids
--on reciprocal crosses
--on crossed maize and verbascum
--on comparison of hybrids and mongrels

Gaudry, Prof., on intermediate genera of fossil mammals in Attica

Geese, fertility when crossed
--upland

Geikie, Mr., on subaerial denudation

Genealogy, important in classification

Generations, alternate

Geoffroy St. Hilaire, on balancement
--on homologous organs

Geoffroy St. Hilaire, Isidore, on variability of repeated parts
--on correlation, in monstrosities
--on correlation
--on variable parts being often monstrous

Geographical distribution

Geography, ancient

Geology, future progress of
--imperfection of the record

Gervais, Prof., on Typotherium

Giraffe, tail of
--structure of

Glacial period
--affecting the North and South

Glands, mammary

Gmelin, on distribution

Godwin-Austin, Mr., on the Malay Archipelago

Goethe, on compensation of growth

Gomphia

Gooseberry, grafts of

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

Gould, Mr., on colours of birds
--on instincts of cuckoo
--on distribution of genera of birds

Gourds, crossed

Graba, on the Uria lacrymans

Grafting, capacity of

Granite, areas of denuded

Grasses, varieties of

Gray, Dr. Asa, on the variability of oaks
--on man not causing variability
--on sexes of the holly
--on trees of the United States