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Authors

B. A. Place

Document Type

Research

Abstract

This is a subject upon which most authorities differ widely, and few, if any, agree upon all points entirely. It is therefore, an inviting field tor research. Because of the extreme diversity of opinions current it has seemed best to me to formulate them in a brief way before giving the results of my own observations.

Publication Date

1906

Journal Title

Proceedings of the Iowa Academy of Science

Volume

13

Issue

1

First Page

261

Last Page

266

Copyright

©1906 Iowa Academy of Science, Inc.

Language

en

File Format

application/pdf

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