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The wings of the insect, which are of an iron gray, are covered with a down of fine hairs. The posterior ones soon disappear. Perhaps the subimago in this genus of Ephemerids, as in certain others, is the permanent aerial state of the female. La Nature. Connecticut is rapidly advancing in the cultivation of oysters.
From this absolute zero of fertility, the pollen of different species applied to the stigma of some one species of the same genus, yields a perfect gradation in the number of seeds produced, up to nearly complete or even quite complete fertility; and, as we have seen, in certain abnormal cases, even to an excess of fertility, beyond that which the plant's own pollen produces.
Bell has given the name to the genus from the shortness of the snout: indeed, the form of the mouth may almost be compared to that of the tortoise: one is led to suppose that this is an adaptation to their herbivorous appetites. It is very interesting thus to find a well-characterized genus, having its marine and terrestrial species, belonging to so confined a portion of the world.
In a few minutes the dwarf reappeared, bearing in his hand a bunch of green leaves. The twigs were pinnated, and at the base of each leaflet, where it joined the common peticle, was a single crimson berry, resembling the common wintergreen, but the genus was unknown to the Shawanoe, though he knew something of medicinal herbs.
Here may be seen hundreds of animals of our own genus exposed in the public bazaars for sale, and examined with as much care, and precisely in the same manner, as we examine horses.
The assertion, however, that a definition must of necessity consist of a genus and differentiæ, is not tenable. It was early remarked by logicians, that the summum genus in any classification, having no genus superior to itself, could not be defined in this manner.
And of the species now living very few will transmit progeny of any kind to a far distant futurity; for the manner in which all organic beings are grouped, shows that the greater number of species in each genus, and all the species in many genera, have left no descendants, but have become utterly extinct.
The carpet of verdure, which stretched at their feet, after bordering the stream for some hundreds of feet, gave place to a long beach, covered with rocks, and shingle, and sea-weed, which ran out into the water in a narrowing point to the north. These "big trees," as they are commonly called in Western America, belong to the genus Sequoia, and are conifers of the fir family.
But when by means, which I cannot conceive, our new grammarians began to extend their ideas, and generalize their words, the ignorance of the inventors must have confined this method to very narrow bounds; and as they had at first too much multiplied the names of individuals for want of being acquainted with the distinctions called genus and species, they afterwards made too few genera and species for want of having considered beings in all their differences; to push the divisions far enough, they must have had more knowledge and experience than we can allow them, and have made more researches and taken more pains, than we can suppose them willing to submit to.
A kind, and not merely a class, may be founded on any one of these, if there be a host of properties behind, of which this one is the index, and not the source. Genus and Differentia are said to be of the essence; that is, the properties signified by them are connoted by the name denoting the species. But both proprium and accidens are said to be predicated of the species accidentally.
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