It perceives moreover that species are made up of sub-species.

It even divides the sub-species.

The Peace River, or woodland, bison has lately been separated as a sub-species (B. bison athabascae), distinguished from the southern and better known form by superior size, a wider forehead, longer, more slender and incurved horns, and by a thicker and softer coat, which is also darker in color.

Most of us grew up in the belief that there was but one, the well-known mountain sheep (Ovis canadensis), but seven new species and sub-species have been produced from the systematic mill within recent years, six of them since 1897.

In the opposite direction, the nearer we get to Bering's Straits the closer is the resemblance to the American wapiti, until the splendid species from the Altai Mountains (C. canadensis asiaticus), and Luehdorf's deer (C. c. luehdorfi) from Manchuria, are regarded only as sub-species of the eastern American form, which they approach through C. c. occidentalis of Oregon and the northwestern Pacific Coast.

The sub-genus Dorcelaphus contains all the forms of the United States; of these, the deer belonging east of the Missouri River, those from the great plains to the Pacific, those along the Rio Grande in Texas and Mexico, those of Florida, and those again of Sonora, are each rated as sub-species of virginiana; to which we must add six more, ranging from Mexico to Bolivia.

The skulls of these brown bears we sent to Dr. Merriam, Chief of the Biological Survey, at Washington, and they proved to be most interesting from a scientific point of view, for from them the classification of the bears of the Alaska Peninsula has been entirely changed, and it seems that we were fortunate enough to bring out material enough to establish a new species as well as a new sub-species.

For this species seems to have become differentiated into several species and sub-species, some of which are well marked, and all of which we do not as yet know much about.

Recently Dr. Elliot has described the Lower California sheep as a sub-species of the Rocky Mountain form under the name O.c.

In other words, that the form or sub-species inhabiting the plains (auduboni) is now extinct over the greater part of its range, occurring only in the localities mentioned by you.

The sub-species auduboni is the easternmost member of the American sheep family, while the sheep of Chihuahua and of Lower California are the most southern now known.

The country they live in is very similar to the bad lands of Dakota, and I dare say that their long life on the plains has created in them a distinct sub-species of the bighorn.

It has already appeared that the duties of all "authentic" epic are broadly the same, and the poems of this kind, though two thousand years may separate their occurrence, may be properly brought together as varieties of one sub-species.

These considerations lead on to the idea of a special development or sub-species of the English language for elementary teaching and foreign consumption.

Sculpture, which in the school of Niccola Pisano had been subordinate to architecture, became a sub-species of painting in the hands of Andrea.

This sub-species of sculpture was freely employed in North Italy to stimulate devotion, and to impress the people with lively pictures of the Passion.