
PREFACE
CHAPTER I - Introductory
CHAPTER II - Meristic Phenomena
CHAPTER III - Segmentation, Organic And Mechanical
CHAPTER IV - The Classification Of Variation AndThe Nature Of Substantive Factors
CHAPTER V - The Mutation Theory
CHAPTER VI - Variation And Locality
CHAPTER VII - Local Differentiation. Continued
CHAPTER VIII - LOCALLY DIFFERENTIATED FORMS. Continued.
CHAPTER IX - THE EFFECTS OF CHANGED CONDITIONS: ADAPTATION
These lectures, first delivered at Yale in the early 1900s, offer a thoughtful survey of how Mendelian ideas reshaped biology. The speaker sets the scene by explaining why a deeper, data‑driven look at variation and inheritance is essential for any credible theory of evolution. Listeners are invited to follow a careful reasoning process that moves from basic experiments to the broader puzzles they raise.
The material stays grounded in concrete examples drawn largely from North American fauna and flora, with vivid descriptions of elephant tusks, warbler plumages, and even polydactyl cats. By weaving together observations, contemporary figures, and candid reflections on what science does not yet know, the work captures both the excitement and the humility of early genetic research.
While the author refrains from speculative grand theories, the discussion sparks curiosity about how tiny hereditary mechanisms might drive the grand patterns of life. It’s a compelling glimpse into a formative moment when genetics began to claim its place at the heart of evolutionary thought.
Language
en
Duration
~9 hours (524K characters)
Publisher of text edition
Project Gutenberg
Credits
Produced by Chris Curnow, Paul Marshall and the Online Distributed Proofreading Team at http://www.pgdp.net (This file was produced from images generously made available by The Internet Archive)
Release date
2014-01-04
Rights
Public domain in the USA.

1861–1926
A key early champion of genetics, this English biologist helped bring Gregor Mendel’s ideas to a wider scientific audience. He even gave the field its name, helping shape how heredity would be studied in the modern age.
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