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some light upon one of the most obscure points of physiology, the reproductive process of Entozoa. The title, extended as it is, will hardly convey to those unacquainted with the views of the author any very clear notion of the peculiar mode of propagation here described. This cannot, however, be a matter of surprise; for although, as Mr. Busk states, some glimpses of the subject were afforded by the naturalist Chamisso, in his observations on the apparent alternations of generation, so far back as 1819, and by the subsequent researches of Sars and Siebold on the development of the Medusae, and by those of Loven on the development of Campanularia, &c., still no one, until the author of the present work,

the medico-chirurgical review

On the alternation of generations : or The propagation and development of animals through alternate generations / by Joh. Japetus Sm. Steenstrup ... Tr. from the German version of C.H. Lorenzen, by George Busk