See page in:
1859
1860
1861
1866
1869
1872

Compare with:
1859
1860
1866
1869
1872

some of the characters of 1859 1860 1861
some of the Characters of 1866 1869
a Character proper to 1872

species, 1859 1861
species , 1860
Species, 1866 1869
Species , 1872

progenitor .— 1859 1861
progenitor. — These propositions will be most readily understood by looking to our domestic races. 1860
Progenitor . 1866
Progenitor . 1869
Progenitor.1872

roots as commonly called, 1859 1860 1861 1866 1869
as commonly called roots, 1872

2 blocks not present in 1859 1860 1861; present in 1866 1869 1872
Many similar cases of analogous variation have been observed by Naudin in the great gourd-family, and by various authors in our cereals. Similar cases occurring with insects under their natural conditions have lately been discussed with much ability by Mr. Walsh, who has grouped them under his law of Equable Variability.

Variety
Variety
variety
of
of
one
one
Species
Species
species
often
often
assumes
assumes
some of the characters of
an
an
allied
allied
species,
or
or
reverts
reverts
to
to
some
some
of
of
the
the
Characters
Characters
characters
of
of
an
an
early
early
progenitor .—
These propositions will be most readily understood by looking to our domestic races. The most distinct breeds of
the pigeon,
pigeons,
in countries
most
most
widely apart, present sub-varieties with reversed feathers on the
head,
head
and
with feathers
feathers
on the
feet, —
feet,—
characters not possessed by the aboriginal rock-pigeon; these then are analogous variations in two or more distinct races. The frequent presence of fourteen or even sixteen tail-feathers in the
pouter
pouter,
may be considered as a variation representing the normal structure of another race, the fantail. I presume that no one will doubt that all such analogous variations are due to the several races of the pigeon having inherited from a common parent the same constitution and tendency to variation, when acted on by similar unknown influences. In the vegetable kingdom we have a case of analogous variation, in the enlarged stems, or roots as commonly called, of the Swedish turnip and Ruta baga, plants which several botanists rank as varieties produced by cultivation from a common parent: if this be not so, the case will then be one of analogous variation in two so-called distinct species; and to these a third may be added, namely, the common turnip. According to the ordinary view of each species having been independently created, we should have to attribute this similarity in the enlarged stems of these three plants, not to the vera causa of community of descent, and a consequent tendency to vary in a like manner, but to three separate yet closely related acts of creation.
With pigeons, however, we have another case, namely, the occasional appearance in all the breeds, of slaty-blue birds with two black bars on the wings,
a
a
white
rump,
loins,
croup,
a bar at the end of the tail, with the outer