Quain's elements of anatomy . eneral Characters.—The white, pale, or colourless corpuscles arefeAV in number as compared with the red, and both on this account andl^ecause of their want of colour, they are not at first easily recognized ina microscopic preparation of blood. Their form is very various, butwhen absolutely at rest they are rounded or spheroidal. Measured inthis condition they are found to be about g-sVo^h of an inch (.001 mm.)in diameter. They are specifically lighter than the red corpuscles. 30 THE BLOOD. The white corpuscle may be taken as the type of a free animal cellIt is a
Quain's elements of anatomy . eneral Characters.—The white, pale, or colourless corpuscles arefeAV in number as compared with the red, and both on this account andl^ecause of their want of colour, they are not at first easily recognized ina microscopic preparation of blood. Their form is very various, butwhen absolutely at rest they are rounded or spheroidal. Measured inthis condition they are found to be about g-sVo^h of an inch (.001 mm.)in diameter. They are specifically lighter than the red corpuscles. 30 THE BLOOD. The white corpuscle may be taken as the type of a free animal cellIt is a minute protoplasmic structure inclosing one or more nuclei, andtheprotoplasm, being to all appearance unaltered from its primitive condition,and unenclosed in a definite membrane or cell-wal], is capable of exhibitingin a high degree the amoeboid movements and other phenomena whichdepend upon the possession of contractility and have been alreadysufficiently described. The white blood-corpuscles are pecuharly apt to FiK. Fig. 29.—Changes of form of a white corpuscle of newts blood, sketched at INTERVALS OF A FEW MINUTES. ThE FIGURES SHOW ALSO THE INTUSSUSCEPTION OFTWO SMALL STARCH GRANULES, AND THE CHANGES OF POSITION WHICH THESEUNDERWENT WITHIN THE CORPUSCLE. (E. A. S.) take into their interior minute solid particles that have been introducedinto the blood (fig. 29) ; this property has served in the hands of Cohn-heim and others as a means of detecting escaped white corpuscles in tissueswhich are wholly extravascular, such as the cornea. Some of the colour-less corpuscles have in their protoplasm a number of comparatively coarseround granules (fig. 21,//) which are generally grouped together round thenucleus. These corpuscles are often distinguished from tlie more commonpaler variety, (fig. 21, p) as the coarsely granular cells, but it has not beenshown that they are different in nature, origin, or destination. Both coarsely granular and finely granular corpuscles are
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