The Occurrence of Barium and Strontium in Insects

Abstract

Barium and strontium may be detected histochemically by the formation of reddish compounds following the treatment of tissues with sodium rhodizonate. Calcium does not appear to react under the neutral conditions employed in the test. Treatment with chromate inhibits the reaction with barium, but not with strontium, providing a means for distinguishing between these elements. Permanent histological sections can bc produced in the usual manner, so long as a neutral fixative is employed.