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Sinopsis
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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Excerpt from On the Varieties of the Shells: Belonging to the Genus Nassa, Lam
The study of varieties in the genus Nassa has achieved one great object, - it has taught us the whole details of the plan on which the external ornamentation of shells has been elaborated. The whole of the variation, from the smooth shell to the most distinctly sculptured examples, is plainly to be seen as effected through almost imperceptible gradations.
An attempt might be made to show the lines of divergence by means of a diagram, but in all the instances in which this has been done in other branches of Natural History the results have not been satisfactory.
Neither a tree-like form nor any genealogical chart could be made to represent varieties in anything like the ramifications in which they occur in Nature, nor could we hope to succeed in such an undertaking without being able to procure a very large additional series of species such as would enable us to follow more closely the missing links in the scale of affinity.
For the most part, I do not regard a peculiar character possessed only by a single specimen as constituting a "variety." Even intermediate links between allied forms are generally represented in my series by two, three, or more, closely similar specimens.
About the Publisher
Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com
This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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On the Varieties of the Shells: Belonging to the Genus Nassa, Lam
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Paperback. Condición: 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. Nº de ref. del artículo: 9781332173303_0
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On the Varieties of the Shells Belonging to the Genus Nassa, Lam Classic Reprint
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PAP. Condición: New. New Book. Shipped from UK. Established seller since 2000. Nº de ref. del artículo: LW-9781332173303
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On the Varieties of the Shells Belonging to the Genus Nassa, Lam Classic Reprint
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PAP. Condición: New. New Book. Shipped from UK. Established seller since 2000. Nº de ref. del artículo: LW-9781332173303
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