Official websites use .gov A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Evolution of the earth and man: a lecture before the Hahnemannian Institute of the Students of the Hahnemann Medical College of Philadelphia, February 3d, 1892
Evolution of the earth and man: a lecture before the Hahnemannian Institute of the Students of the Hahnemann Medical College of Philadelphia, February 3d, 1892