Abstract
ALTHOUGH the mechanism of plant-gall formation by insects has long provided a field for speculation, there are few records of attempts to induce such growths experimentally. The range of successful essays is practically limited to trials with Cecidomyid larval secretions and egg extracts in lanolin, injections of salivary gland extracts from a Coccid and Adelges abietis 1, and Martin's reproduction of pseudo-galls on sugar-cane with whole-insect extracts of a Jassid and other insects2.
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