Title: Castañeda, un gringo, fray Reginaldo y un Darwin cristiano
Subjects: Biography, History
Places: Argentina
People: Reginaldo de la Cruz Saldaña Retamar (b. 1875), Darwin Angel Passaponti (d. 1945), Francisco de Paula Castañeda (1776-1832), Paolo Mantegazza (1831-1910)