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1859
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1859
1860
1861
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seems to me well to 1859 1860 1861 1866 1869
well 1872

correlated with others, 1859 1860 1861 1866 1869
in combination, 1872

points of structure from the proper type of the order, yet M. Richard sagaciously saw, as Jussieu observes, that this genus should still be retained amongst the Malpighiaceæ. This case seems to me well to
illustrates
illustrate
the spirit
with which
of
our
classifications
classifications.
are
....
sometimes
....
necessarily
....
founded.
....
Practically
Practically,
when naturalists are at work, they do not trouble themselves about the physiological value of the characters which they use in defining a
group,
group
or in allocating any particular species. If they find a character nearly uniform, and common to a great number of forms, and not common to others, they use it as one of high value; if common to some lesser number, they use it as of subordinate value. This principle has been broadly confessed by some naturalists to be the true one; and by none more clearly than by that excellent botanist, Aug. St. Hilaire. If
several trifling
certain
characters are always found correlated with others, though no apparent bond of
connexion
connection
can be discovered between them, especial value is set on them. As in most groups of animals, important organs, such as those for propelling the blood, or for
aërating
aerating
aërating
it, or those for propagating the race, are found nearly uniform, they are considered as highly serviceable in classification; but in some groups
of animals
of animals
all these, the most important vital organs, are found to offer characters of quite subordinate value. Thus, as Fritz
Müller
Müller
has lately remarked, in the same group of crustaceans, Cypridina is furnished with a heart, whilst in
too
two
closely allied genera, namely Cypris and Cytherea, there is no such organ; one species of Cypridina has well-developed branchiæ, whilst another species is destitute of them.
We can see why characters derived from the embryo should be of equal importance with those derived from the adult, for
our
a natural
classifications
classification
of course
include
includes
all