Quain's elements of anatomy . onate length and breadth of the oval, vary in difEerentinstances, so that in some fishes the elliptical form is almost shortened into acircle. The size of the corpuscles differs greatly in the different classes of Vertebrata;they are largest in the Amphibia. Thus in the frog they are about —g th of aninch long and xto)*^ broad ; in Proteus anguinus, j,[,oth of an inch long andyL^ th broad : in Amphiuma tridactylum, where they are largest, the red corpus-cles are one-third larger than those of the Proteus. In birds they range in lengthfrom about ^ 55*^ ^^ 1700^^ °^
Quain's elements of anatomy . onate length and breadth of the oval, vary in difEerentinstances, so that in some fishes the elliptical form is almost shortened into acircle. The size of the corpuscles differs greatly in the different classes of Vertebrata;they are largest in the Amphibia. Thus in the frog they are about —g th of aninch long and xto)*^ broad ; in Proteus anguinus, j,[,oth of an inch long andyL^ th broad : in Amphiuma tridactylum, where they are largest, the red corpus-cles are one-third larger than those of the Proteus. In birds they range in lengthfrom about ^ 55*^ ^^ 1700^^ °^ ^^ inch. Amongst mammals the elephant has thelargest red blood-corpuscles fg^gth of an inch) ; those of the dog average gs^ii^^-^of an inch ; those of the sheep g^th of an inch ; the goat was long supposed * The one-thousandth part of a millimeter is often known as a micro-millimeter ormicron, and is represented by the Greek letter /^. The diameter of a red blood corpuscleis then exi3ressed as 7—8 microns (7 ytt—8 u).. BED COEPUSCLES. 25 to have the smallest, (-^^ th of an inch) but Gulliver found them about half thissize in. the Meminna and Napu deer. In observations upon the blood of different races of mankind, Richardson foundno constant difference, the average diameter of the red blood-corpuscle beingg-L-th of an inch. The corpuscles of many mammals, and notably the dogamong the common domestic animals, approach so nearly in size to the humanblopd-corpuscles as to be qmte undistiaguishable from them. Fig. 22. ^c ?
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Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy
