. Elements of histology. Histology. Blood. 23. brown or l)l;ick powder—the luematin ; but it can be obtained in a crystalline form, as liydrochlorate of hi\iinatin (Fig. 18). These crystals also are of micro- scopic size, of a nut-brown colour, of the shape of nari'ow rhombic plates, and are called lut^rnin cry- stals, or Teich- mann^s crystals. In extravasated hu- man blood, crystals of a bright yellow or orange colour are occasionally met with ; they are coverer, hctmatoidin. tical with bilirubin human bile. 13. The white or colourless cor- puscles, or leucocytes, are in human blood of about
. Elements of histology. Histology. Blood. 23. brown or l)l;ick powder—the luematin ; but it can be obtained in a crystalline form, as liydrochlorate of hi\iinatin (Fig. 18). These crystals also are of micro- scopic size, of a nut-brown colour, of the shape of nari'ow rhombic plates, and are called lut^rnin cry- stals, or Teich- mann^s crystals. In extravasated hu- man blood, crystals of a bright yellow or orange colour are occasionally met with ; they are coverer, hctmatoidin. tical with bilirubin human bile. 13. The white or colourless cor- puscles, or leucocytes, are in human blood of about 2-5 00 ^^ 2"5Vo *^^ ^^ ^^^^ in diameter—i e. about 10 fi—and are spherical in the circulating blood or in blood that has just been removed from the vessels. Their substance is transparent granular-looking protoplasm, some containing larger or smaller distinct granules. These granules are not all of the same nature, as will presently appear. In some kinds of blood, notably horse's, they are of a reddish colour, and these corpuscles were supposed by some observers (Semmer and Alexander Schmidt) to be intermediate between red and white corpuscles. The protoplasm of the colourless corpuscles contains occasionally glycogen (Ranvier, Schiifer). In the blood of the lower verte- brates the colourless corpuscles are much larger than Fig. 17.—Hitmoglobin crystals. A, Of guinea-pig; b, of siiuirrel; c, D, buiuan. called by Yirchow, their dis- They are supposed to be iden- obtainable from Fig. IS.—Ha-miii 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; Edkins, John Sydney, b. 1865. Philadelphia : Lea Brothers
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