Excerpt from On the Varieties of the Shells: Belonging to the Genus Nassa, Lam
The study of variation has opened up a subject so vast in its dimensions that the mind almost shrinks from the task of estimating it. In every direction variation extends, in every way variation seems to ramify, until we gaze and wonder if there be any end.
Instead of 200 Species, at least Varieties are before me, and the end appears nearly as far off as ever. Taking a careful survey of the shells under consideration, and noting more particularly the common forms and the changes presented by them, we are enabled to form an estimate of the enormous number likely to be met with, if we persevere in our work of collecting varieties.
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Paperback. Zustand: New. Print on Demand. This book examines the evolutionary history of a genus containing over 30,000 species of sea snails. Through exploration of the biological and physical factors that can influence evolution, the author discredits fixed species distinctions. Studying the vast range of variation within Nassa, the author argues that the observed patterns can only be understood by recognizing individuals as existing on a spectrum of variation. Delving into a wealth of natural history observations, the book expands on a growing body of evidence showing that species evolve in gradual, nearly imperceptible steps. Researchers interested in the evolution of species and those interested in the study of sea snails will find this book a compelling read. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book. print-on-demand item. Bestandsnummer des Verkäufers 9781332173303_0
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Anbieter: PBShop.store US, Wood Dale, IL, USA
PAP. Zustand: New. New Book. Shipped from UK. Established seller since 2000. Bestandsnummer des Verkäufers LW-9781332173303
Anbieter: PBShop.store UK, Fairford, GLOS, Vereinigtes Königreich
PAP. Zustand: New. New Book. Shipped from UK. Established seller since 2000. Bestandsnummer des Verkäufers LW-9781332173303
Anzahl: 15 verfügbar