Medical and surgical reports . hereditary, the same deformity appearing in different genera-tions.— Nichols. Loe. cit. Intra-uterine ulcerations andadhesions, and other pathological processes may for the pur-pose of such deformities as are here presented in this paperbe left out of account, as the deformities involve not only theskin and subcutaneous tissues, but also the bones, and un-doubtedly the muscular tissues, etc., as well. Referring to the evolutionary and embryological outline ofthe development of the hand as given above, it becomes evi- 10 ANOMALIES OF THE PHALANGES. dent that the a
Medical and surgical reports . hereditary, the same deformity appearing in different genera-tions.— Nichols. Loe. cit. Intra-uterine ulcerations andadhesions, and other pathological processes may for the pur-pose of such deformities as are here presented in this paperbe left out of account, as the deformities involve not only theskin and subcutaneous tissues, but also the bones, and un-doubtedly the muscular tissues, etc., as well. Referring to the evolutionary and embryological outline ofthe development of the hand as given above, it becomes evi- 10 ANOMALIES OF THE PHALANGES. dent that the arm and hand are homologous with the pectoralfin of fishes, the wing of the bird and bat, and the fore. FIGURE 8. limb of mammals. It is an interesting matter for specu-lation whether the webbing of the fingers may not be areversion to some ancestral type in which the digits were ANOMALIES OF THE PHALANGES. 11 united by a web. The fact that in all the. cases which havecome under the writers observation syndactylism has beenassociated with anomalies of the phalanges and sometimes
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