Author Description

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1896 edition. Excerpt: ...buttresses, of which the contiguous ones conjoin in the valleys of the crown and obstruct the middle of their course for more than half the depth. The summits of the inner lobes, prolonged on their buttresses, are subdivided into rows of tubercles. The anterior buttress of the first inner lobe is continuous, with an equally strong tubercular ridge in advance of the position of the contiguous outer lobe, producing a conspicuous feature of the front of the crown. The posterior two inner lobes have their posterior buttresses nearly obsolete. The outer lobes of the crown, narrower than the inner ones, are medially extended towards the latter rather than fore and aft, though in these positions tubercles springing from their base and occupying the valleys are rudiments of the buttresses of the inner lobes. The summits of the outer lobes are divided into transverse rows of rounded tubercles. The summits of the pairs of lobes are separated by angular notches, and deeper angular notches separate the summits of the inner lobes. In the second and fourth pairs of lobes the notches are rendered shallower, from the development of a medial tubercular offset from the contiguous inner lobe. The first outer lobe displays three eminences at its summit; the succeeding outer lobes, transverse rows of four eminences. The talon of the crown is a strong semicircular projection of the base, from which springs a row of half a dozen unequal nipple-shaped eminences. The basal ridge, especially thick at the inner front part of the crown, extends interruptedly along the inner side and behind the talon, and is more conspicuously marked at the entrance of the valleys. Considerable irregular cementum occupies the deeper recesses of the crown. The measurements of the...