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" ... clearly the dentistry of the tribe, that we extract his account : — " The rat has formidable weapons in the shape of four small, long, and very sharp teeth, two of which are in the upper and two in the lower jaw. These are formed in the shape of... "
Curiosities of Natural History - الصفحة 88
بواسطة Francis Trevelyan Buckland - 1865 - عدد الصفحات: 362
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The Quarterly Review, المجلد 101

1857 - عدد الصفحات: 640
...the lower jaw. These are formed in the shape of a wedge, and by the following wonderful provision of nature have always a fine, sharp, cutting edge. On...glass-like enamel, which is excessively hard. The upper teeth work exactly into the under, so that tire centres of the opposed teeth meet exactly in...

The Quarterly Review, المجلد 101

William Gifford, Sir John Taylor Coleridge, John Gibson Lockhart, Whitwell Elwin, William Macpherson, William Smith, Sir John Murray (IV), Rowland Edmund Prothero (Baron Ernle) - 1857 - عدد الصفحات: 612
...the lower jaw. These are formed in the shape of a wedge, and by the following wonderful provision of nature have always a fine, sharp, cutting edge. On...outside is composed of a glass-like enamel, which i* excessively hard. The upper teeth work exactly into the under, so that the centres of the opposed...

Friends' Weekly Intelligencer, المجلد 14

1858 - عدد الصفحات: 836
...the lower jaw. These are formed in the shape of a wedge, and by the following wonderful provision of nature have always a fine, sharp, cutting edge. On...glass-like enamel, which is excessively hard. The upper teeth work exactly into the under, so that the centres of the opposed teeth meet exactly in the...

Curiosities of Natural History

Francis Trevelyan Buckland - 1859 - عدد الصفحات: 434
...formed in the shape of a wedge, and by the following wonderful provision of Nature, have always ji fine sharp cutting edge. On examining them carefully,...the inner part is of a soft, ivory-like composition, tvhich may be easily worn .'i way, whereas tli3 outside is composed of a glassl.ke enamel, which is...

Curiosities of Civilization

Andrew Wynter - 1860 - عدد الصفحات: 554
...the lower jaw. These are formed in the shape of a wedge, and by the following wonderful provision of nature have always a fine, sharp, cutting edge. On...glass-like enamel, which is excessively hard. The upper teeth work exactly into the under, so that the centres of the opposed teeth meet exactly in the...

Neighbors with Claws and Hoofs, and Their Kin: For Boys and Girls

James Johonnot - 1885 - عدد الصفحات: 268
...examining them we find that the inner part is of an ivory-like substance, which is easily worn away, while the outside is composed of a glass-like enamel, which is excessively hard. The upper teeth work exactly into the under, in the act of gnawing, so that the soft part is continually...




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