VESTIGIAL STROCTUORES. IOI 
with congenital talipes equino-varus should also retain 
the simian type and not exceed in length the tibial 
malleolus. Careful dissections of such limbs have shown 
this to be the case, and in specimens of congenital 
talipes equino-varus in children just born, and in those 
who in spite of the deformity have attained mature age, 
the tibial and fibular malleoli are equal in length. 
Summarizing these facts, we find that in the human 
embryo the fibula gives evidence that primitively it was 
nearly, if not quite, equal to the tibia in size; that 
during development the malleoli present, in length and 
relation to the astragalus, conditions which are perma- 
nent in mammals closely allied to man; that the increased 
length of the fibular malleolus firmly fixes the foot in the 
standing position ; and that the thinness of the fibula 
and its long malleolus is accompanied by the incon- 
venience of predisposing him to the occurrence of Pott’s 
fracture. 
