The paper of which we here give an abstract has just appeared in the last number of the author’s ‘Archiv f. Mikroskop. Anatomie,’ in which it occupies more than 100 pages, and is illustrated with eight quarto plates. It is undoubtedly one of the most interesting and important contributions to our knowledge of the very difficult structure of which it treats that has ever appeared, and it may be taken as giving an almost exhaustive account of all that is known on the subject, together with much, more especially in the physiological part of the subject, altogether new ; and we deeply regret that our space prevents our giving a more lengthy notice of its contents, or, what would have been very desirable, a complete translation of it.

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