Document Type

Article

Journal/Book Title/Conference

Journal of Agricultural Research

Volume

47

Issue

6

Publisher

U.S. Government Printing Office

Publication Date

1-1-1933

First Page

375

Last Page

398

Abstract

The beneficial effects of ultraviolet light on higher animals such as chickens, rats, and human beings are now well known. It has been used with gr eat success in the treatment of such diseases of man as tuberculosis of the skin, bones, or viscera, skin diseases of various kinds, rickets, and tetany. Not so well known, perhaps, are the harmful effects of ultraviolet light on various organisms. Bacteria, for example, are readily killed by the so-called "middle ultra-violet", that is, by radiations of wave lengths between 210 and 297 mμ 3; plants are rather generally harmed by wave lengths shorter than 290 mμ 4; and animals, including man, may suffer from serious burns or internal disorders from it under certain conditions.

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