Talk Origins Archive
The Origin of Species, Chapter 14
The entire text of Charles Darwin's book, The Origin of Species is available on this site. This link is specifically for the chapter that discusses embryology as evidence for evolution.
New York University
Nyu: Darwin's Evidence for Evolution: Embryology
Concise description of embryology as evidence for evolution, as used by Darwin.
PBS
Pbs: Comparative Embryology: The Vertebrate Body
Provides a student handout in PDF format that looks at the developmental stages of five vertebrate organisms from fertilization to adult form. Students can look at the pictures to see the similarities and differences at the embryo stage...