Origin of Species Variorum

→ probably, habit and selection have 1859 1860 1861 1866

habit and selection have probably 1869

habit and selection have 1872

←Subtitle not present 1859 1860 1861 Special Instincts. 1866 1869 1872

→ three, out of the several which I shall have to discuss in my future work,— 1859 1860 1861 1866

three, out of those which I shall have to discuss in my future work,— 1869

three,— 1872

←Subtitle not present 1859 1860 1861 Instincts of the Cuckoo .— 1866 1869 1872

→ now commonly admitted 1859 1860 1861 1866

supposed by some naturalists 1869 1872

→ cuckoo's instinct 1859 1861

cuckoos instinct 1860

most remarkable of the instincts of the cuckoo 1866

instinct of the cuckoo 1869 1872

→ nest. 1859 1860 1861 1866 1872

nest. If this were the case, the process of laying and hatching might be inconveniently long, more especially as she migrates at a very early period; and the first hatched young would probably have to be fed by the male alone. 1869

→ asserted 1859 1860 1861 1866

both asserted and denied 1869 1872

→ hear on the high authority of Dr. Brewer, that this is a mistake. 1859 1860 1861 1866

have lately heard from Dr. Merrell, of Iowa, that he once found in Illinois a young cuckoo together with a young jay in the nest of a Blue jay ( Garrulus cristatus ); and as both were nearly fully feathered, there could be no mistake in their identification. 1869

have lately heard from Dr. Merrell, of Iowa, that he once found in Illinois a young cuckoo together with a young jay in the nest of a Blue jay (Garrulus cristatus); and as both were nearly fully feathered, there could be no mistake in their identification. 1872

accumulating,

accumulating

during successive generations, peculiar mental habits and actions, which at first appeared from what we must in our ignorance call an accident. In some cases compulsory habit alone has sufficed to produce

~~such~~

such

inhe- rited

inherited

mental changes; in other cases compulsory habit has done nothing, and all has been the result of selection, pursued both methodically and

unconsciously:

unconsciously;

but in most

cases

cases,

→probably, habit and selection have

probably concurred.

acted together.

→

We shall, perhaps, best understand how instincts in a state of nature have become modified by selection, by considering a few cases. I will select only →three, out of the several which I shall have to discuss in my future work,— namely, the instinct which leads the cuckoo to lay her eggs in other

birds

birds'

nests; the slave-making instinct of certain ants; and the

cell-making

comb-making

power of the

hive-bee;

hive-bee.

hive-bee:

These

these

two latter instincts have

generally

generally,

and

~~most~~

most

justly

justly,

been ranked by naturalists as the most wonderful of all known instincts. →

It is →now commonly admitted that the more immediate

~~and final~~

and final

cause of the →cuckoo's instinct is, that she lays her eggs, not daily, but at intervals of two or three days; so that, if she were to make her own nest and sit on her own eggs, those first laid would have to be left for some time unincubated, or there would be eggs and young birds of different ages in the same →nest. If this were the case, the process of laying and hatching might be inconveniently long, more especially as she

~~has to~~

has to

migrates

migrate

at a very early period; and the first hatched young would probably have to be fed by the male alone. But the American cuckoo is in this predicament; for she makes her own

nest,

nest

and has eggs and young successively hatched, all at the same time. It has been →asserted that the American cuckoo occasionally lays her eggs in other

birds

birds'

nests; but I →hear on the high authority of Dr. Brewer, that this is a mistake.