In a work published by one of us in 1859, a close comparative examination was made of the doctrines of those observers, who in Germany and Belgium had occupied themselves with the subject of the metamorphoses of the Entozoa and their peregrination through the living organism. The obvious result of this examination was to excite very weighty doubts in every thoughtful mind. M. Davaine, in his remarkable ‘Traité des Entozoaires,’ also says that the conclusion in his mind, from the agreement in the facts and the divergence in the opinions of the experimenters, was “that the question still demands sound criticism and fresh researches.”

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