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Compiled by Henry D. Hubbard of the U. S. Bureau of Standards; Publiihed by W. M. Welch Manufacturing Company, Chicago. SCALE: Greatly Reduced

A. Chart of the Atoms.

Concise information on atomic structure as well as 40 different characteristics of the atoms is given in this chart. The original is lithographed in six colors, and all routine information is printed in large type. It can be obtained in two sizes, 42" x 64" and 22" X 30".

Compiled by Henry D. Hubbard of the U. S. Bureau of Standards; Published by W. M. Welch Manufacturing Company, Chicago.

B. A Reproduction of One Unit of the Chart of the Atonns, and the Key Used fo Interpret All of the Graphic Illustrations on 52A.

The right side is a reproduction, in one color only, of the unit which represents the element Potassium. The left side appears as a key at the lower right of each chart.

Chapter 5 GENEOLOGY AND GENETICS CHARTS