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Document Type

Research

Abstract

For the past thirty years one of my major interests has been Organic Evolution, and coupled with that for most of this period has been Vertebrate Paleontology, with special emphasis on the earliest vertebrates. Taxonomic study of these primitive forms has been bound to lead to phylogenetic speculation, and of recent years that aspect has dominated my interest. At the same time I have become increasingly concerned with problems of the mode or modes of occurrence of evolutionary changes. Merging these two has given rise to some serious problems.

Publication Date

1955

Journal Title

Proceedings of the Iowa Academy of Science

Volume

62

Issue

1

First Page

493

Last Page

497

Copyright

© Copyright 1955 by the Iowa Academy of Science, Inc.

Language

EN

File Format

application/pdf

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