Abstract
1. 1. A quantitative colorimetric assay for hydroxyproline was used to measure changes in the distribution of nematocysts in Hydra. The assay was based on the observation that probably most of the intracellular hydroxyproline of Hydra is localized in the nematocysts. 2. 2. The distribution in hydroxyproline during bud development changed significantly. The large amounts of hydroxyproline observed in the “bud zone” during early development were subsequently found in the detached bud. 3. 3. The hydroxyproline lost from the tentacles on feeding was replaced within 2 days. At this time a maximum amount of hydroxyproline per tentacle was reached. 4. 4. These results are discussed in relation to the general problems involved in a quantitative study of the mechanisms involved in the distribution of nematocysts.
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