| → may here add, that I 1859 1860 1861 1866 |
| OMIT 1869 1872 |
|
| → only briefly give 1859 1860 1861 1866 |
| only give 1869 |
| give only 1872 |
|
| → several of the 1859 1860 1861 1866 |
| the same 1869 1872 |
|
| → differ 1859 1860 1861 1866 1869 |
| of the same species differ 1872 |
|
| → of 1859 1860 1861 1866 |
| belonging to 1869 |
| belonging to other 1872 |
|
| → birds within 1859 1860 1861 1866 1869 |
| with birds the individuals of 1872 |
|
| → country vary in a remarkably small degree, 1859 1860 1861 1866 |
| country vary in a remark- ably small degree, 1869 |
| species, inhabiting the same country, vary extremely little, 1872 |
|
| → seems to me certainly 1859 1860 1861 1866 1869 |
| certainly seems 1872 |
|
|
The rule being so plainly applicable in the case of secondary sexual characters, may be due to the great variability of these characters, whether or not displayed in any unusual
of which fact I think there can be little doubt. But that our rule is not confined to secondary sexual characters is clearly shown in the case of hermaphrodite cirripedes;
I
→may here add, that I
particularly attended to Mr.
remark, whilst investigating this Order, and I am fully convinced that the rule almost
holds
I shall, in
future work, give a list of
more remarkable cases; I will here
→only briefly give
one, as it illustrates the rule in its largest application. The opercular valves of sessile cirripedes (rock barnacles) are, in every sense of the word, very important structures, and they differ extremely little even in
genera; but in the several species of one genus, Pyrgoma, these valves present a marvellous amount of
the homologous valves in the different species being sometimes wholly unlike in shape; and the amount of variation in the individuals of
→several of the
species is so great, that it is no exaggeration to state that the varieties
→differ
more from each other in the characters
these important
than do
species
→of
distinct genera. |
|
| As
→birds within
the same
→country vary in a remarkably small degree,
I have particularly attended to
and the rule
→seems to me certainly
to hold good in this class. I cannot make out that it applies to plants, and this would
shaken my belief in its truth, had not the great variability in plants made it particularly difficult to compare their relative degrees of variability. |
|
| When we see any part or organ developed in a remarkable degree or manner in
species, the fair
|
