The Journal of General Physiology
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The Journal of General Physiology, Vol 6, 289-293, Copyright © 1924 by The Rockefeller University Press

ARTICLE

HYDROGEN ION CONCENTRATIONS WITHIN THE ALIMENTARY TRACT OF INSECTS

W. J. Crozier 1

1 From the Zoological Laboratory, Rutgers College, New Brunswick.

Larvæ of Psychoda and of Chironomus (diptera) maintained in solutions of appropriate indicators show that the typical acidities (pH) prevailing within the several regions of the digestive tract are: esophagus 7.1; cardiac chamber 6.2; mesenteron 7.5; the latter being functionally an intestine. The acidity of the hindgut, pH 6.4, is due to the discharge of the malphigian tubules.

Submitted on November 12, 1923


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