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The word “kneel” derives from the Proto-Indo-European root “genu-” which meant both “knee” and “angle.”

Par� declared that genu valgum, that is knock-knees, were due to similar causes as those which produced club foot, or at least that the affections were related.

They begin at their antero-ventral part near the genu of the corpus callosum and the anterior pillars of the fornix, and these are the parts which first appear in the lower mammals.

Backward curving of the upper end of the tibia has been already described as one of the causes of genu recurvatum.

These necessaries are confined at the knee by a transverse row of pearl buttons crossing the genu patella.