... 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 88بواسطة Francis Trevelyan Buckland - 1865 - عدد الصفحات: 362عرض كامل - لمحة عن هذا الكتاب
| 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... | |
| 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... | |
| 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... | |
| 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... | |
| 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... | |
| 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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