On the Tritubercular Theory


IN a brilliant address, read last year before the American Association for the Advancement of Science,1 Prof. H. F. Osborn has brought together and laid before us the latest results of American research to which Mammalian Palæontology owes so much. Necessarily much space is given to the exposition of the theory of the development of the cusps of mammalian teeth. Never before has the tritubercular theory been so lucidly explained, so logically followed out; never before have its weaknesses been so obvious, its errors so plain.

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