Prognathism "presents too many individual varieties to be taken as a distinctive character of race."
"The Negro"
W.E.B. Du Bois
The teeth are small, regular, and very white; the incisors and "eye teeth" are not disproportionately large, as is usually the case among the Japanese; there is no tendency towards Prognathism; and the fold of integument which conceals the upper eyelids of the Japanese is never to be met with.
"Unbeaten-Tracks-in-Japan"
Bird, Isabella L. (Isabella Lucy)
A quarter of the series show no Prognathism.
"A Racial Study of the Fijians"
Norman E. Gabel