
| Transcriber's note: | A few typographical errors have been corrected. They appear in the text like this, and the explanation will appear when the mouse pointer is moved over the marked passage. Figures 41 and 42 have been interchanged from the printed copy in order to match the text. |
Princeton University - THE LOUIS CLARK VANUXEM FOUNDATION LECTURES FOR 1915-1916
In this thoughtful series of four lectures, a leading experimental zoologist revisits the foundations of evolutionary theory at a time when genetics was just emerging as a scientific discipline. He begins by questioning how the term “evolution” is used across astronomy, engineering, and biology, pointing out that many everyday explanations confuse description with explanation. By re‑examining classic fossil evidence and the language that surrounds it, he sets the stage for a more precise, evidence‑based discussion.
The later lectures turn to the new science of heredity, the physical nature of the germ plasm, and the role of random variation in shaping living forms. Rather than dismissing Darwin’s ideas, the speaker frames them as a provisional framework that must incorporate recent discoveries in chromosome behavior and mutation. Listeners are offered a clear, historically grounded view of how early twentieth‑century research began to reshape the debate over how species change over time.
Language
en
Duration
~2 hours (155K characters)
Publisher of text edition
Project Gutenberg
Credits
Produced by Bryan Ness, Keith Edkins, and the Online Distributed Proofreading Team at https://www.pgdp.net. Pages scanned by Bryan Ness.
Release date
2009-12-17
Rights
Public domain in the USA.

1866–1945
A pioneer of modern genetics, this Nobel Prize-winning scientist helped show that genes are carried on chromosomes. His famously meticulous work with fruit flies turned a tiny lab organism into one of biology’s most powerful tools.
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