The Dental cosmos . Permanent first and second incisors of afourteen year-old Ayrshire cow, showingmarked wearing by attrition. In Fig. 10 I have reproduced a portionof the lower jaw of a specimen of Bohsondiacus, Java (No. 1271 in the mu-seum of the Landwirtschaftliche Hoch-schule), in which the mesial surface Fig. : H n . Right side lower jaw of Has sondiactts,showing abrasion of mesial and lingual sur-faces of first premolar. of the first premolar on the rightside has a large wedge-shaped defect extends upon the lingual sur-face, but appears there flatter and reachesfarther
The Dental cosmos . Permanent first and second incisors of afourteen year-old Ayrshire cow, showingmarked wearing by attrition. In Fig. 10 I have reproduced a portionof the lower jaw of a specimen of Bohsondiacus, Java (No. 1271 in the mu-seum of the Landwirtschaftliche Hoch-schule), in which the mesial surface Fig. : H n . Right side lower jaw of Has sondiactts,showing abrasion of mesial and lingual sur-faces of first premolar. of the first premolar on the rightside has a large wedge-shaped defect extends upon the lingual sur-face, but appears there flatter and reachesfarther toward the morsal surface of thetooth. On the left side the correspond-ing tooth is still more worn, and the 686 THE DENTAL COSMOS. entire lingual wall with a part of themorsal surface is worn away. This re-sult appears to be brought about by fric-tion of the food under the pressure of thetongue during the many hours of dailygrazing and chewing. This tooth, stand-ing at the end of the row, is naturallymuch more exposed than the others. It is not impossible that unusuallycoarse food may have been taken by theanimal at some period of its life, and the be accounted for by the fact that in theincisors of the horse the enamel extendswell toward the end of the root and thedentin is not exposed at the neck, where-as t
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