. Elements of histology. Histology. Chap. II.] Blood. !3. The elements of the blood described by Dr. William Norris, of Birmingham, as the invisible, pale, or third corpuscle, are simply red blood corpuscles that have become discoloured by the mode of preparation (Alice Hart). 12. The haemoglobin of the red blood corpuscles forms crystals (Fig. 10), which differ in shape in the various mammals. They are always of microscopic size, and of a bright red colour. In man and most mammals they are of the shape of prismatic needles, or rhombic plates; in the squirrel they are hexagonal plates, and in
. Elements of histology. Histology. Chap. II.] Blood. !3. The elements of the blood described by Dr. William Norris, of Birmingham, as the invisible, pale, or third corpuscle, are simply red blood corpuscles that have become discoloured by the mode of preparation (Alice Hart). 12. The haemoglobin of the red blood corpuscles forms crystals (Fig. 10), which differ in shape in the various mammals. They are always of microscopic size, and of a bright red colour. In man and most mammals they are of the shape of prismatic needles, or rhombic plates; in the squirrel they are hexagonal plates, and in the guinea-pig they are tetrahedral or octa- hedral. The blood pigment itself is an amorphous dark-brown or black powder—the hcematin ; but it can be obtained in a crystalline form as hydro- chlorate of h8ematin(Fig. 11). These crystals ^^jjkfe also are of microscopic size, of a nut-brown *g» 4 colour, of the shape of narrow rhombic " " plates, and are called hcemin crystals, or Teichmann's crystals. In extravasated human blood crystals of a bright yellow or orange colour are occasionally met with ; they are called by Virchow, their discoverer, hcematoidin. They are supposed to be identical with bilirubin, obtainable from human bile. 13. The white or colourless blood cor- puscles are in human blood of about ^oVo *° 2W0 of an inch in diameter, and are spherical in the Fig. 10.—Haemoglobin crystals. A, Of guinea-pig; b, of squirrel; c, d, human. —Hse- min Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Klein, E. (Edward), 1844-1925. Philadelphia : H. C. Lea's Son
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