. A study of the causes underlying the origin of human monsters : third contribution to the study of the pathology of human embryos . Fig. 276a.—Photograph of the ovum. Natural Fig, 276b.—Interior of the ovum, showing broken embryo on one side of it. Natural size. 268 MALL. [Vol. XIX. they are invaded at numerous points by the syncytium, whichforms in them small vesicles, lined with two layers of cells,and often filled with dense masses of small round cells. Thesevesicles are very numerous and usually communicate with the

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