74 On the Similarity between the Bed Blood-eorpuscles of Man 
the measurements of Gulliver, • 00794 mm., Welcker, * 00774 mm., 
and KoUiker, '00751 mm., which have been already quoted in 
this paper, the following values: Eohin,* '0073 mm.; Harting, 
•0074 mm.; Valentin, f '0071 mm.; and Austin Flint, junr.,t 
•00726 mm. (Ww inch). 
I have thus shown that we are not justified, either by the facts 
of the case or by the authorities supposed to favour the possibility 
of doing so, in attempting to distinguish between the blood of man 
and that of the dog by the measurement of their red corpuscles. 
Mr. Gulliver himself, indeed, appears to have come to a similar 
conclusion, not only with regard to the dog, but of other animals, 
for he tells us that the corpuscles of the quadrumana " differ but 
little from those of man, being only just appreciably, or sometimes 
not at all, smaller, both in the monkeys of the Old and New Conti- 
nents," and that " in the seals, otters, and dogs, the corpuscles are 
about as large as in man."§ I myself have not made systematic 
measurements of the blood of any of these animals, and am there- 
fore unable to speak as authoritatively with regard to them as I 
can about the dog. From Mr. Gulliver's detailed measurements, 
appended to Gerber's ' Elements,' however, I am led to beheve that 
there are several other animals whose blood, even in the fresh state, 
could not be distinguished by the dimensions of the red corpuscles 
from that of man. Among the domestic animals I may especially 
mention the rabbit and guinea-pig as belonging to this category. 
To these, besides most of both the monkeys of the Old and New 
World, the seals and the otters, we may add the kangaroo, the 
capybara, the wombat, and the porpoise. In the case of all these 
animals we not merely find that the average size," calculated in 
Mr. Gulliver's peculiar way, approximates dangerously to the 
average assigned to man, but the classic -g^^V^j^^ ^n inch figures 
among the " common sizes " recorded by Mr. Gulliver for each. 
The foregoing remarks and measurements refer especially to 
the fresh blood of the animals mentioned, and to thin layers quickly 
(' Memoire sur les Parties Microscopiques du Sang,' Paris, 1838, p. 10), from which 
I take the following, reducing the values which both Mandl and Wagner give in 
vulgar fractions of a Paris line to decimals of a millimeter: Leeuwenhoek (1673), 
•00902; lb. (1720), -01327; Jurin (1717), '00789; Tabor (1724), -00723; Senac 
(1749), -00820 ; Muys (1751), -01128 ; Weiss (1760), -01085; Delia Torre (1763), 
•00301; Blumenbach (1789), -00789; Villar (1804), -00564; Sprengel (1810), 
•00902; Kater(1819), -00677; Bauer and Home (1818), -01504; Young (1819), 
•00451; Rudolphi (1821), -00902; Prevost and Dumas (1821), -00705; Edwards 
(1826), -00814; Hodgkin (1827), '00902; Wollaston (1827), -00525; Weber (1830), 
•00525; Muller (1834), "00525 to '00902; Schultz (1836), '00667 to '00836; 
Wagner (1838), '00645 to '00752; Mandl himself gives '00800. 
* Charles Robin, " Note sur Quelques Points de 1' Anatomie et de la Physiologie 
des Globules Rouge du Sang," ' Journal de la Physiologie,' torn. i. (1858), p. 283. 
t I cite the estimates of Harting and Valentin from Welcker's paper, cited 
above, p. 258. 
X ' The Physiology of Man,' vol. i.. New York, 1866, p. Ill, 
§ ' Proceedings of the Zoological Society,' 1862, p. 96. 
