. Compendium of histology. Histology. CLASSIFICATION OF THE TISSUES. 21 E. Compound tissues : 16. Vessels; 17. Glandular tissue ; and 18. Nerve tissue. We shall, therefore, proceed in this manner, and turn first to the blood. " Blood is quite a peculiar sort of juice," Goethe lets his Mephistopheles say. Modern science, after nearly a hundred years, endorses the apothegm completely. If a little drop of this fluid, which appears homogeneous to the naked eye, is spread out in a thin layer under the micro- scope, we are surprised by a peculiar image. The homoge- neous red has disappeare
. Compendium of histology. Histology. CLASSIFICATION OF THE TISSUES. 21 E. Compound tissues : 16. Vessels; 17. Glandular tissue ; and 18. Nerve tissue. We shall, therefore, proceed in this manner, and turn first to the blood. " Blood is quite a peculiar sort of juice," Goethe lets his Mephistopheles say. Modern science, after nearly a hundred years, endorses the apothegm completely. If a little drop of this fluid, which appears homogeneous to the naked eye, is spread out in a thin layer under the micro- scope, we are surprised by a peculiar image. The homoge- neous red has disappeared ; we perceive innumerable yellow- colored cells in a colorless fluid. The fluid is called plasma, the cells bear the name of the colored or red blood corpuscles (Fig. 10, a, b, c). Among the colored companions, still another, though not abundant, colorless structure may be noticed by closer examination. This is the lymphoid cell of the blood, the so-called white blood corpuscle id). The human red blood cells are diminutive structures ; they measure only to mm. Their smallness and their innumerable quantity renders it possible that a small space— a cubic millimetre of blood—may contain five millions of them. Their form, as Fig. 10 showed, is spherical, the periphery appears yellow, the centre bright and nearly colorless. When the blood corpuscle rolls over the microscopical glass slide, the side view presents the appearance of c. Our cell, conse- quently, represents a cir- cular disc, with excavated central portions of both broad Fig. 28.—Red blood corpuscles of man with water ; b, in evaporating plasma ; a, treated dried; it, after coagulation ; e, rouleaux-like arrangement. The red blood corpuscle is, besides, a very changeable. 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 work.
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