Abstract
Summary
1. A study has been made of the peroxidase activity (guaiac test) during the embryonic development of the grasshopper, Melatzoplus differentialis. 2. At constant temperature (25°C.) negative peroxidase reactions are found for pre-diapause eggs. Positive reactions are given for diapause and post-diapause eggs, Embryos after hatching give negative reactions. 3. Exposure of prediapause eggs to low temperatures (0-5°C.) apparently destroys a naturally occurring inhibitor so that eggs thus treated always give positive peroxidase reactions. 4. Ideas are expressed as to possible manner in which peroxidase inhibitors function. 5. No correlation between cellular and peroxidase activity seems apparent.
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