SPLIT-HAND AND SPLIT-FOOT DEFOEMITIES, 
THEIR TYPES, ORIGIN, AND TRANSMISSION*. 
By THOMAS LEWIS, D.Sc, M.D. etc., and DENNIS EMBLETON, 
B.A., M.R.C.S. etc. 
(From University College Hospital.) 
CONTENTS. 
PAGE 
Introductory 26 
Detailed Account of the Deformities of the " G " Family 27 
Types of Sj^lit-foot, their Terminology, and the Nature of the Cross-boues . 36 
Origin and Transmission of the Deformity 43 
(a) General 43 
(6) Maternal impressions 44 
(c) Origin in an acquired lesion (extrauterine) 44 
(d) Arrests of development 45 
(e) Atavism 45 
(/) Origin as a result of intrauterine conditions ...... 46 
(g) Origin as a " sport 48 
(h) Transmission of "Hereditary Split-foot," its stability, and the relation 
of its mode of transmission to Mendelism 50 
Summary and Chief Conclusions 56 
Bibliography 56 
Explanation of Plates 58 
Introductory. 
The deformity presented by the family described in this communication is one 
of exceptional interest and has so far received little attention. Accounts of it, of a 
brief and scattered nature, sometimes with figures, are to be found in the works of 
many of the well-known teratologists, such as Geoffroy Saint-Hilaire, Ammon, 
Forster and Otto. 
In a Japanese temple an image of it has assumed, states Perthes (p, 136), 
the dignity of a god ; a cloven hoofed deity. 
* To this paper, written in November 1907, a short postscript, dated March 2nd, 1908, has been 
added. It will be found in the Miscellanea of this number. 
