Excerpt from Journal of Anatomy and Physiology, 1868
My attention has been recalled to this subject by an interesting paper, on the blood-corpuscles of the two-toed sloth, by Professor Rolleston, published in the current number of the Microscopical Journal.
The author refers to a statement by Dr W. Kuhne, to the effect that, among Mammalia, the camel and sloth only have nucleated colored corpuscles of the blood; and to other writers, who say that such cells have been observed in more mammalia, and that colored blood-cells in size and shape resembling those of mammalia are found in certain oviparous vertebrates.
Of the sloth, Professor Rolleston and Mr H. N. Moseley observed, in a dried specimen of the blood, that though a certain number of the colored corpuscles contained one or more nuclei more or less roughly hewn, and irregularly and eccentrically placed, the immense majority of those corpuscles presented a non-nucleated character. And, in some stale blood of an elephant, which had died a week before the examination, Dr Rolleston notes many colored nucleated cells, in which the colored part was inside while the envelope was colorless.
Further observations are required to prove how far such phenomena may be due either to a solution and displacement of the coloring matter from commencing putrefaction, or to an irregular refraction of and interference in the light by disfigured and discolored parts of these decaying corpuscles. As it does not appear that the so-called nuclei were subjected to chemical examination, we are left in doubt as to their real character.
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