. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 62 Royal Society :— coloured particle organically connected with the cell-wall could be satisfactorily made out. The best specimens were prepared from human blood drawn in the fasting-condition, and from the blood of a kitten two days old. From well-prepared specimens of human blood the following par- ticulars were gathered (see fig. 1, A) :—Nearly every disk possessed the parietal macula ; it could be distinctly recognized in nine-tenths of them ; and in several of those in w
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 62 Royal Society :— coloured particle organically connected with the cell-wall could be satisfactorily made out. The best specimens were prepared from human blood drawn in the fasting-condition, and from the blood of a kitten two days old. From well-prepared specimens of human blood the following par- ticulars were gathered (see fig. 1, A) :—Nearly every disk possessed the parietal macula ; it could be distinctly recognized in nine-tenths of them ; and in several of those in which it was not at first visible, it came into view as the corpuscles revolved in the field. Fig. « V ^^ J ^ A. Human blood; B. Fowl's blood, treated witb magenta. The macula was clearly situated in the cell-wall, and not in the interior of the corpuscle. Usually it appeared as if imbedded or set in the rim of the disk, like the jewel in a diamond ring ; but some- times it occupied various positions on the flat surfaces, and when so placed, the spot was difficult or impossible to detect. It commonly presented a thickly lenticular shape ; sometimes it was square, and occasionally in appearance vesicular (fig. 1, A, a). In some instances, and especially in long-kept specimens, the particle was seen to stand out on the outline of the disk like an excrescence. Still more rarely, instead of a spot, a thick red line ran round the circumference for a quarter or a third of its extent (fig. 1, A, b). As a rule it was extremely minute, covering generally not more than a twentieth or thirtieth of the circumference ; but there v/as a considerable variation in its magnitude and distinctness. Very rarely two specks could be seen ; but the occurrence of adhering granules rendered the verification of this point extremely difficult. This description applies, so far as the inquiry has yet been prose- cuted, to the mammalian blood-disk generally, making allowances for differences in size
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