Variation and Correlation in the Crayfish: With Special Reference to the Influence of Differentiation and Homology of Parts (Classic Reprint) - Hardcover

Raymond Pearl

Hardcover

ISBN 10: 0266266479 ISBN 13: 9780266266471

Publisher: Forgotten Books, 2018

Synopsis

Variation and Correlation in the Crayfish offers a clear look at how parts relate and vary.

This volume examines how differentiation and homology influence the way crayfish joints vary together, using careful measurements and biometric analysis to explore underlying factors.

The study analyzes eleven measured characters from crayfish legs and body, focusing on how size, position, and shared developmental history shape patterns of change. It combines direct observation with quantitative methods to separate growth effects from morphological relationships.

Readers will see how the researchers distinguish gross correlations from partial correlations, and how physiological factors like growth compare to anatomical homology in shaping variation.

• A detailed account of measurement choices and why distal leg joints are especially informative
• An explanation of how partial correlations are used to isolate effects of size
• Discussion of how differentiation and homology influence correlation, with real data from crayfish
• Context on how these methods contribute to broader questions in variation and morphogenesis

Ideal for readers of early 20th‑century biometrical studies and anyone curious about how scientists quantify variation in living organisms.

Edition details

• Publisher: Forgotten Books
• Publication date: 2018
• Language: English
• ISBN 10: 0266266479
• ISBN 13: 9780266266471
• Binding: Hardcover
• Number of pages: 78