Texts printed in italics and bold face in the source document have been transcribed between _underscores_ and =equal signs=. Small capitals have been replaced with ALL CAPITALS. By Albert M. Reese, Ph.D. Professor of Zoölogy in West Virginia University Author of “An Introduction to Vertebrate Embryology”…
Your support pays for translating these classics into more languages.
Support for $12/month DonateSubscribers read with instant translation, without waiting for the free daily limit.