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As there are objections to considering these characters as of family value, arising from the intermediate position of the circumpolar genera Alces and Rangifer, as well as the water deer and the roe, a broader meaning is given to classification by retaining the comprehensive genera Cervus and Mazama, and recognizing the subordinate divisions only as sub-genera.
Animals known as Squirrels are of three very distinct kinds viz., Squirrels, properly so called; Ground Squirrels: and Flying Squirrels. These three kinds are very naturally separated into three different genera; but the closet naturalists, not content with this simple division, have again subdivided them into other sub-genera, using very difficult names to distinguish them.
It is a truly wonderful fact the wonder of which we are apt to overlook from familiarity that all animals and all plants throughout all time and space should be related to each other in groups, subordinate to groups, in the manner which we everywhere behold namely, varieties of the same species most closely related, species of the same genus less closely and unequally related, forming sections and sub-genera, species of distinct genera much less closely related, and genera related in different degrees, forming sub-families, families, orders, sub-classes, and classes.
Moreover, the species of the large genera are related to each other, in the same manner as the varieties of any one species are related to each other. No naturalist pretends that all the species of a genus are equally distinct from each other; they may generally be divided into sub-genera, or sections, or lesser groups.
I shall content myself with observing that the genus of the kangaroos has been divided into two sub-genera, the true Kangaroos, and those known as Kangaroo Rats. The difference, however, is not very great, since the rats are as mild and inoffensive in their habits as the kangaroos themselves.
Moreover, the species of the larger genera are related to each other, in the same manner as the varieties of any one species are related to each other. No naturalist pretends that all the species of a genus are equally distinct from each other; they may generally be divided into sub-genera, or sections, or lesser groups.
The true Vulpine Opossum which is a native of Australia, near Port Jackson is very much like a small fox; but there are two sub-genera of the phalangers that differ much from this form. One of these is the Scham-scham, a very beautiful spotted creature found in the Molucca and Papuan islands.
We divide them into families and sub-families, genera and sub-genera, species and varieties, but there is an endless shifting of characters in these groups.
In our diagram, this is indicated by the broken lines, beneath the capital letters, converging in sub-branches downwards towards a single point; this point representing a single species, the supposed single parent of our several new sub-genera and genera. In this case, its affinities to the other fourteen new species will be of a curious and circuitous nature.
It is a truly wonderful fact the wonder of which we are apt to overlook from familiarity that all animals and all plants throughout all time and space should be related to each other in group subordinate to group, in the manner which we everywhere behold namely, varieties of the same species most closely related together, species of the same genus less closely and unequally related together, forming sections and sub-genera, species of distinct genera much less closely related, and genera related in different degrees, forming sub-families, families, orders, sub-classes, and classes.
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