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As soaring birds seem at times to rest against the very substance of cloud, as if upheld by some thin lift of air, so these insects glided as easily and skimmed as swiftly upon the surface film of water. I did not know even the genus of this tropical form; but insect taxonomists have been particularly happy in their given names I recalled Hydrobates, Aquarius, and remigis.
"But," we fancy we hear some one inquire impatiently, "what do those academic, technical distinctions matter to us? Whether the avian tuberculosis germ is a variety or a true species may be left to the taxonomists, but it is of no earthly importance to us." On the contrary, it is of the greatest importance.
Brambles and roses are widely known instances, but oaks, elms, apples, and pears, Mentha, Prunus, Vitis, Lactuca, Cucumis, Cucurbita and numerous others are in the same condition. In some instances the existence of elementary species is so obvious, that they have been described by taxonomists as systematic varieties or even as good species. The primroses afford a widely known example.
After this minute examination by the experts, if no organic differences stand revealed, the reason is that they do not exist. Any dissimilarity of structure could not escape the accurate eyes of our learned taxonomists. The genus, therefore, is indeed organically homogeneous; but industrially it is thoroughly heterogeneous. The implements are the same and the work is different.
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