"Dr. Langenbeck mentions a family of Silesian peasants who seemed to have an hereditary predisposition to the abnormity known as microcephalism, or small-headedness."
"The instances of reversion here discussed are microcephalism, which Darwin wrongly interpreted as atavistic, supernumerary mammae, supernumerary digits, bicornuate uterus, the development of abnormal muscles, and so on."
"(microcephalism) and reversion to lower forms are next discussed."