Excerpt from Collected Papers, No. 10, Vol. 2: Biochemical, Physiological, and Zoological Papers
Pulex irritans (pl. XXVIII, figs. 1 and A start was made with about a dozen specimens captured at Loughton and, although a few specimens were received from a friend in Hampshire, ... it is very doubtful if there is any infusion of blood from this source in the stocks used for the experiments, as the survivors of the specimens received were very feeble.
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