his discoveries in the Delaware gravels considered, [330] et seq.;
Implements in the river-drift at Trenton, [333];
Supposed palæolithic implements from the valley of the Delaware, [334], [388];
on the pre-Indian race, [336];
importance of his discoveries, [356];
on the origin of Americans, [369];
on the tertiary man, [387];
researches in the Trenton gravels, [388];
finds a molar tooth, [388];
and a human jaw, [388];