. Electro-physiology. Electrophysiology. i ORGANISATION AND STRUCTURE OF MUSCLE 35 Sometimes the sarcoplasm will be found only in the centre of the fibre, densely heaped up in a round, or slit-like, cavity. The muscle-columns, which in such cases form broad bands, are set radially round the central mass' of nucleated protoplasm, like the leaves of a book, separated only by very fine lamellae of sarcoplasm, a disposition already familiar to us in the uni- nuclear muscle-cells of many invertebrates. According to Eollett, the direct transition to this most characteristic structure in the muscles
. Electro-physiology. Electrophysiology. i ORGANISATION AND STRUCTURE OF MUSCLE 35 Sometimes the sarcoplasm will be found only in the centre of the fibre, densely heaped up in a round, or slit-like, cavity. The muscle-columns, which in such cases form broad bands, are set radially round the central mass' of nucleated protoplasm, like the leaves of a book, separated only by very fine lamellae of sarcoplasm, a disposition already familiar to us in the uni- nuclear muscle-cells of many invertebrates. According to Eollett, the direct transition to this most characteristic structure in the muscles of the Dytiscidre is found in numerous little Carabidse, Brachinus, and the common wasp, where the muscle-fibres are more or less elongated in cross-section, and present radially situated Cohnheim's area? in their longer diameter. Eetzius (19) was the first to describe the very delicate trans- verse figures exhibited by the muscle-fibres of Dytiscus man/, in. 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 Biedermann, W. (Wilhelm), 1852-1929; Welby, Frances A. (Frances Alice). London : Macmillan
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