, on lines of escarpment
Wichura, Max, on hybrids
Wings, reduction of size
--of insects homologous with branchiae
--rudimentary, in insects
Wolf crossed with dog
--of Falkland Isles
Wollaston, Mr., on varieties of insects
--on fossil varieties of shells in Madeira
Wollaston, Mr., on colours of insects on sea-shore
--on wingless beetles
--on rarity of intermediate varieties
--on insular insects
--on land-shells of Madeira naturalised
Wolves, varieties of
Woodcock with earth attached to leg
Woodpecker, habits of
--green colour of
Woodward, Mr., on the duration of specific forms
--on Pyrgoma
--on the continuous succession of genera
--on the succession of types
World, species changing simultaneously throughout
Wright, Mr. Chauncey, on the giraffe
--on abrupt modifications
Wrens, nest of
Wyman, Prof., on correlation of colour and effects of poison
--on the cells of the bee
Youatt, Mr., on selection
--on sub-breeds of sheep
--on rudimentary horns in young cattle
Zanthoxylon
Zebra, stripes on
Zeuglodons
End of Project Gutenberg Etext Origin of Species, 6th Edition, by Darwin
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