70개의 결과 중 1 - 5개
... instincts of the cuckoo, ostrich, and parasitic bees— Slave-making ante— Hive-
bee, its cell-making instinct — Difficulties on tho theory of the Natural Selection of
instincts— Neuter or sterile insects— Summary, . . . . .181 CHAPTER VIII.
In the case of the misseltoe, which draws its nourishment from certain trees,
which has seeds that must be transported by certain birds, and which has flowers
with separate sexes absolutely requiring the agency of certain insects to bring
I should never have expected that the branching of the main nerves close to the
great central ganglion of an insect would have been variable in the same species
: I should have expected that changes of this nature could nave been effected ...
We may instance Rubus, Rosa, and Hiera- cium amongst plants, several genera
of insects, and several genera of Brachiopod shells. In most polymorphic genera
some of the species have fixed and definite characters. Genera which are ...
How many of those birds and insects in North America and Europe, which differ
very slightly from each other, have been ranked by one eminent naturalist as
undoubted species, and by another as varieties, or, as they are often called, ...
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