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Date Book For 1931

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Calendar for 1931

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Date Book For 1931

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Digitized by the Internet Archive

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1931 Thursday 1, Jan.

Spent the morning checking unusual atrox in my collection (i.e., SD County, Sonora, N.W. Arizona, New Mexico) Cook having checked the balance.

Also studied rattles and got a good idea of the method of production. For the first time discovered that the rattle is the hardened result of a hardened exudation from the under skin (not a part of the skin as previously supposed) laid down as a granular and laminated material following the corrugations of the skin below. There is much more to be done on this.

In the afternoon listened to the football game and worked on tabular and totalying sheet forms