The nasal fossre are hollow cavities in the facial bones, of varying importance, depending upon whether the animal is water-breathing or air-breathing; in the first group they serve exclusively as organs of olfaction, in the second they constitute, in addition, special canals through which the inspired air passes in order to reach the pharynx and the bronchial tubes. •This translation is made with the approval of Professor Dieu-Ia:r~, and with the kind consent of M. Felix Alcan, publisher of the Journal de l'Anatomie et de la Physiologie Normales et Patholcglques de I'Homme et des Animaux. The translator feele that the high merit of Prof. Dieulafe's monograph and the absence of a similar work in English justify the effort here made to extend its sphere of usefulness.

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