MR. H. N. Moseley, of Exeter College, called my attention a few days ago to the appearance of nucleation which a slide of the dried blood-corpuscles of the Two-toed Sloth, Cholœpus didactylus, presented under a quarter-of-an-inch object-glass of Powell and Lealand’s. I had a short time before met with a statement in the recently published second part of Dr. Kühne’s ‘Lehrbuch der Physiologischen Chemie,’ p. 195, to the effect that only some mammals, the sloth and the camel, possessed nucleated blood-corpuscles. And this coincidence determined me to use such means as we had at our disposal for settling a point as to which all recent authorities were, as far as my knowledge went, opposed to Dr. Kühne.

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