Document Type

Article

Journal/Book Title/Conference

Journal of Agricultural Research

Volume

42

Issue

7

Publisher

U.S. Government Printing Office

Publication Date

4-1-1931

First Page

379

Last Page

419

Abstract

In considering the reactions of a given animal to light of different wave lengths there are three fundamental questions which perhaps come first to mind: (1) The extent of the spectrum for this animal – that is, the wave lengths of the shortest and longest radiations to which it responds, (2) the relative efficiency of the different wave lengths in eliciting the same response, and (3) the extent to which the animal distinguishes the different wave lengths, or the number of chromas that it distinguishes.

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