RED CORPUSCLES '. — COLOURLESS CORPUSCLES. 



711 



brated Animals, expressed in fractions of an inch. Where two 

 measurements are given, they are the long and the short diameters 

 of the same corpuscles. (See also Fig. 372.) 



Camel . 1-3254, 1-5921 

 Llama . 1-3361, 1-6294 

 Java Musk-Deer . 1-12325 

 Caucasian Goat . 1-7045 

 Two-toed Sloth . 1-2865 



Golden Eagle 1-1812, 1-3832 

 Owl . . 1-1830, 1-3400 

 Crow . 1-1961, 1-4000 

 Blue-Tit . 1-2313, 1-4128 

 Parrot . 1-1898, 1-4000 



Ostrich " . 



Cassowary 



Heron 



Fowl 



Gull. 



1-1649, 1-3000 

 1-1455, 1-2800 

 1-1913, 1-3491 

 1-2102, 1-3466 

 1-2097, 1-4000 



Turtle . 1-1231, 1-1882 



Crocodile 1-1231, 1-2286 



Green Lizard 1-1555, 1-2743 



Slow-worm 1-1178, 1-2666 



Viper . 1-1274, 1-1800 



Frog . 



Water-Newt 



Siren 



Proteus 



Lepidosiren 



1-1108, 1-1821 

 1-814, 1-1246 

 1-420, 1-760 

 1-400, 1-727 

 1-570, 1-941 



Perch 



Carp 



Gold-Fish 



1-2099, 1-2824 

 1-2142, 1-3429 

 1-1777, 1-2824 



Pike 



Eel 

 Gymnotus 



1-2000, 1-3555 

 1-1745, 1-2842 

 1-1745, 1-2599 



Thus it appears that the smallest red corpuscles known are those 

 of the Music- Deer; whilst the largest are those of that curious 

 group of Batrachian (frog-like) Reptiles which retain their gills 

 through the whole of life ; and one of the oval blood-disks of the 

 Proteus, being more than 30 times as long and 17 times as broad as 

 those of the Musk-deer, would cover no fewer than 510 of them. — 

 According to the recent estimate of Vierordt, a cubic inch of 

 Human Blood contains upwards of eighty millions of Red cor- 

 puscles, and nearly a quarter of a million of the White. 



556. The ' White ' or ' Colourless ' corpuscles are more readily 

 distinguished in the blood of Reptiles than in that of Man ; being, 

 in the former case, of much smaller size, as well as having a 

 circular outline (Fig. 370, c) ; whilst in the latter their size and 

 contour are nearly the same, so that, as the Red corpuscles them- 

 selves when seen in a single layer have but a very pale hue, the 

 , deficiency of colour does not sensibly mark their difference of 

 nature. It is remarkable that, notwithstanding the great varia- 

 tions in the sizes of the Red corpuscles in different species of 

 Verte brated animals, the size of the White is extremely constant 

 throughout, their diameter being seldom much greater or less than 

 l-3000thof an inch in the Warm-blooded classes, and l-2500th in 

 Reptiles. Their ordinary form is globular ; but their aspect is 

 subject to considerable variations, which seem to depend in great 

 part upon their phase of development. Thus in their early state, 



