Abstract
Male goldfish (Carassius auratus) injected with pituitary extract responded by an increase in gonadal hydration. The magnitude of this response varied with the species of the donor and roughly approximated the phylogenetic closeness of the donor to the recipient. This relationship seemed true in general application but was not borne out by all donor groups. Closely associated taxonomic groups may exhibit rather wide divergences in the response elicited. Such variations in response might be due to the presence of inhibitory substances in the hormone extract.
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