BLOOD. 



[ 83 ] 



BLOOD. 



than convex, the nucleus projecting some- 

 what laterally. 



The red corpuscles of the Mammalia are 

 not furnished with a nucleus, whilst in Birds, 

 Fishes, and Reptiles a distinct nucleus exists ; 

 this is usually oval, but sometimes rounded 

 in the latter. 



The colourless corpuscles of the Vertebrata 

 (figs. 21-30 b), or the lymph corpuscles as 

 they are sometimes called, are spherical, of 

 a granular appearance, highly refractive and 

 specifically lighter than the coloured corpus- 

 cles. They consist of a cell-wall containing 

 numerous larger or smaller granules and 

 molecules, with one or more nuclei. Acetic 

 acid dissolves the granules, and brings the 

 nuclei to view. The cell-wall is often undi- 

 stinguishable, unless water be added to the 

 corpuscles, which being imbibed, separates 

 it from the contents. 



The blood of the Invertebrata has not 

 been so thoroughly examined. Li many of 

 them there are two circulating liquids ; one 

 coloured, but containing no corpuscles, the 

 other colourless and containing rounded or 

 irregular granular colourless nucleated cor- 

 puscles (figs. 31-35), much resembling the 

 colom-less corpuscles of the Vertebrata, but 

 remarkably prone to shoot out processes like 

 the Amoebae. 



The sizes of the coloured corpuscles of 

 many vertebrate animals are given in the 

 subjoined list, nearly all the measm'ements 

 being those by Mr. Gulliver. It may be 

 remarked, that whilst the largest coloured 

 corpuscles occiu- in the Reptiles, the smallest 

 are found in the Mammalia; and that 

 the size of the corpuscles is in general 

 proportionate to the size of the animal, 

 in animals of the same order, but not in 

 those of different orders. Thus in the 

 larger Ruminants and Rodents, the corpus- 

 cles are larger than in the smaller ones ; 

 whilst the smallest British mammal, the 

 Harvest-mouse, has corpuscles as large as 

 those of the Horse; and in the common 

 mouse they are larger than in the Horse or 

 Ox. 



Mammalia. 

 Bimana. 



Man 1-3200 to 1-3500" 



Quadrumana. 



Chimpanzee( Simla Troglodytes) 1 -34 1 2 



Monkey (Cercopithecus mono). 1-3468 

 Monkey, mean of eight other 



species 1-3450 



Lemur, mean of four species . . 1-40/7" 



Cheiroptera. 



Bat {Vespertilio murinus) .... 1-4175 

 (Vespertilio pijnstrellus) . 1-4324 



Insectivora. 



l{edgehog{Erinaceus europceus) 1 -4085 



Mole (Talpa europcea) 1-4747 



Carnivora. 



Badger (Meles vulgaris) 1-3940 



Bear, mean of five species .... 1 -3708 



Dog {Canis familiaris) 1-3542 



Fox {Canis Vulpes) 1-4117 



Lion {Felis Leo) 1-4322 



Seal (Phoca vitulijia) 1-3281 



Cetacea. 



Dolphin {Delphinus Phoccena). 1-3829 

 Whale {Balcena mysticetus) . . 1-4000 

 (Balcena Boops) 1-3099 



Pachydermata. 



Elephant {Elephas indicus) . . 1-2745 



Horse {Equus cahallus) 1-4706 



Pig [Sus Scrofa) 1-4230 



Rhinoceros indicus 1-3765 



Ruminantia. 



Camel {Camelus hac- 



trianus) .... Ig. 1-3123 br. 1-5876 

 Dromedary ( Camelus 



dromedarius). . Ig. 1-3254 br. 1-5921 



Goat [Capra hircus) 1-6366 



Musk (Moschus javanicus). . . . 1-12325 



Stag (Cervus ela.phus) 1-4324 



Ox {Bos Taurus) 1-4267 



Sheep [Ovis Aries) 1-5300 



Edentata. 



Armadillo (Dasypus sex- cinctus) 1 -3457 

 Sloth (Unau, Brady pus didac- 



tylus) 1-2865 



Rodentia. 



Guinea-pig ( C«ma cobaya). . . . 1-3538 



Mouse {Mus musculus) 1-3814 



Rabbit {Lepus cuniculus) .... 1-3607 



Rat (Mus Rattus) 1-3754 



Marsupialia. 



Kangaroo (Macropus), mean of 



three species 1-3460 



Monotremata. 



Platypus, duck-billed {Ornitho- 



rhynchus paradoxus) 1-3000 



G 2 



