FIG. 52.--Astacus fluviatilis.--A, a single muscular fibre, transverse diameter 1/110th of an inch; B, a portion of the same more highly magnified; C, a smaller portion treated with alcohol and acetic acid still more highly magnified; D and E, the splitting up of a part of a fibre, treated with picro-carmine, into fibrillae; F, the connection of a nervous with a muscular fibre which has been treated with alcohol and acetic acid. a, darker, and b, clearer portions of the fibrillae; n, nuclei; nv, nerve fibre; s, sarcolemma; t, tendon; 1-5, successive dark granular striae answering to the granular poritons, a, of each fibrilla.
[Editor's note: illustration is reproduced here approximately twice the size of the woodcut in the book.]
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