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Show 94 MR. GULLIVER ON THE BLOOD-CORPUSCLES. [Feb. 10, between these corpuscles of Moschus moschiferus and those of Cervus nemorivagus will appear by a comparison of fig. 2 in the above woodcut with fig. 7 in the ' Proceedings' of the Zoological Society above cited. In M. moschiferus none of the blood-corpuscles presented those curious and irregular shapes which I have described and figured in certain Cervidae (Lond. and Edin. Phil. Mag. Nov. 1840, and Proc. Zool. Soc. Feb. 25, 1862, fig. 7). Tragulus.-The average diameter of the blood-disks of T. javanicus and T. meminna is ^A-5 of an inch, and the extreme sizes j~0 and A - of an inch; and of T. stanleyanus the average size of the corpuscles is ^rW= of an inch. These measurements of the smallest r 10,825 known blood-disks of Mammalia are here quoted from my Tables for comparison. Orycteropus capensis.-Not long after the death of the true Musk-deer died an Orycteropus and Ailurus; and I am also indebted to Prof. Flower for an opportunity of examining the blood of these two animals. W e made a cursory examination together of their blood-disks, and easily saw that those of Orypteropus were much the largest. But the power of the instrument then used was insufficient, and I completed the examination at home. After m y discovery of the large size of the red blood-corpuscles of Myrmecophaga and Bradypus (Proc. Zool. Soc. June 11, 1844, and Jan. 24, 1854), the similar magnitude of the corresponding corpuscles of Orycteropus was expected; and they are certainly among the largest known in Mammalia. From many measurements the average diameter of the red blood-corpuscles of Orycteropus capensis proves to be no less than -JTS^ °^ a n hich, with many gradations between the few two extremes of one-third smaller and one-third larger than the average size. Such varieties of size are common in the blood-disks of single species throughout the Vertebrate subkingdom The red blood-corpuscles of Orycteropus are so nearly of the same size as those of the Elephant and Myremecophaga that it would be difficult to distinguish these three animals by their blood-disks, as will appear by comparing fig. 4 of the above woodcut with figs. 6 and 9 in the Proceedings of the Zoological Society for Feb. 25, 1862. Ailurus fulgens.-The average size of the blood-disks is -jy^T of an inch, thus nearly corresponding with those of Procyon, Nasua, and Meles; but its next neighbour, Cercoleptes, in the zoological systems, has blood-disks so much smaller as to indicate that it may be but an aberrant member of that family which includes Ailurus. Import and Relations of the Size of the red Blood-corpuscles.- Previously to m y researches it was commonly said, after Hewson, that the size of the blood-disks has no relation to that of the species-and truly, if regard be had only to such different animals as the Mouse and Horse. But my measurements clearly proved that there is so far such a relation in Mammalia of one natural order or family that the smallest blood-disks occur in the small species and the largest blood-disks in the large species of that order or family. Among Rodents, e. g., I discovered the largest blood-disks in the great |