. The Crayfish : an introduction to the study of Zoology. 176 THE MORPHOLOGY OF THE COMMON CRAYFISH. of the body consists of one or more of the following eight histological groups :— 1. Blood corpuscles; 2. Epithelium; 3. Connective tissue; 4. Muscle ; 5. Nerve; 6. Ova; 7. Spermatozoa; 8. Cuticle. 1. A drop of freshl_y-drawn blood of the crayfish con- tains multitudes of small particles, the blood corpuscles,. 10 ^^ Vl5 ^l Fig. 40.—Adacns fnrinfilig.—The corpuscles of the blood, higlily magrnified. l^S, show the changes undergone by a single cor- puscle during a quarter of an hour ; «, the nuc
. The Crayfish : an introduction to the study of Zoology. 176 THE MORPHOLOGY OF THE COMMON CRAYFISH. of the body consists of one or more of the following eight histological groups :— 1. Blood corpuscles; 2. Epithelium; 3. Connective tissue; 4. Muscle ; 5. Nerve; 6. Ova; 7. Spermatozoa; 8. Cuticle. 1. A drop of freshl_y-drawn blood of the crayfish con- tains multitudes of small particles, the blood corpuscles,. 10 ^^ Vl5 ^l Fig. 40.—Adacns fnrinfilig.—The corpuscles of the blood, higlily magrnified. l^S, show the changes undergone by a single cor- puscle during a quarter of an hour ; «, the nucleus ; 0 and 10 are corpuscles killed by magenta, and having the nucleus deeply stained by the colouring matter. which rarely exceed l-700th, and usually are about 1-lOOOth, of an inch in diameter (fig. 49). They are sometimes i:>ale and delicate, but generall}' more or less dark, from containing a number of minute strongly refracting granules, and thej' are ordinarily exceedingly irregular in form. If one of them is watched continu-. 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 Huxley, Thomas Henry. London
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