The Theory of Evolution With Special Reference to the Evidence Upon Which It is
The book The Theory of Evolution With Special Reference to the Evidence Upon Which It is was written by author Scott, William Berryman, 1858-1947 Here you can read free online of The Theory of Evolution With Special Reference to the Evidence Upon Which It is book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Theory of Evolution With Special Reference to the Evidence Upon Which It is a good or bad book?
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The Recent and Pleistocene horses, including in that term not only the true horses, but also the asses, zebras, etc. , have a skeleton which is wonder- fully adapted to swift running, while their teeth are highly specialized and elaborated for the masticating of grasses, which are among the most abrasive of plants. The front teeth (incisors) used for cropping, continue to grow for a long period and have on their biting surfaces a deep pit, lined with enamel, which horsemen call the "mark. " The... grinding teeth are very high-crowned, growing persistently in height, as they are worn down, to an advanced period of life, when the formation of roots puts an end to growth; they have masticating surfaces which are kept rough by the different hardness of the three substances exposed on these surfaces, dentine, 100 THE THEORY OF EVOLUTION enamel and cement, which wear unequally. The arrangement of the three tooth-substances is in a highly characteristic and very complex pattern, and the anterior grinding teeth (premolars) are similar in form and size and in the pattern of the masticat- ing surface to the posterior teeth (molars).
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