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In this paper the author describes a series of experiments on the ova of the Salmon, made with the intent of ascertaining their power of endurance under a variety of circumstances without loss of life, with the expectation suggested by Mr. Darwin, that the results might possibly throw some light on the geographical distribution of fishes.

proceedings of the royal society of london

II. Some observations on the ova of the Salmon, in relation to the distribution of species; in a letter addressed to Charles Darwin , Esq., M. A., V. P. R. S. &c.” By John Davy, M. D., F. R. SS. Lond. & Edinb., Inspector-General of Army Hospitals