. Electro-physiology . lamella, and does not stain with any other reagent. The lamella itself remains colourless. This, as will presently appear, arises from a reaction common to all muscles—on the one hand, of the plas- matic ground-substance, on the other, of the contractile fibrils— which thus affords an invaluable means of studying the distribu- tion of the two within one fibre. From this reaction we may conclude that the interfibrillar substance (which of course forms a a spiral lamella) is identical with the axial sarcoplasm, so that the cortical substance in other cases also should cont
. Electro-physiology . lamella, and does not stain with any other reagent. The lamella itself remains colourless. This, as will presently appear, arises from a reaction common to all muscles—on the one hand, of the plas- matic ground-substance, on the other, of the contractile fibrils— which thus affords an invaluable means of studying the distribu- tion of the two within one fibre. From this reaction we may conclude that the interfibrillar substance (which of course forms a a spiral lamella) is identical with the axial sarcoplasm, so that the cortical substance in other cases also should contain formative plasma in addition to the con- tractile fibrils, - - as is directly proved by the radial striatioii of the cross - sections. There is, however, a deplorable lack of any systematised compara- tive observations on the finer structure of invertebrate muscle according to modern methods. Knoll .(!.•:>)> writing on the relative scarcity and abund- ance of protoplasm in muscle- fibres, communicated numerous data, which, however, bear less on the finer structure of the cortical substance than 011 the proportion between sarcoplasm and Contractile Substance ill FIG. 9.— Transverse section of muscle-cell from -, the mantle of Eledone moschata. (Ballowitz.) the muscles of vertebrate and invertebrate animals. From these, as well as from earlier re- searches (H. Fol, 14), it is evident that the muscle-cells of Lamelli- branchs and Gasteropoda have in many cases the same structure as those of Cephalopoda. The appearance of double oblique (in many cases also of transverse) striation in the muscle-cells of the adductor muscle of the Lamellibranchs is very interesting. Fol, previous to Ballowitz, had established an analogous theory of structural relations, since he described the contractile sheath of the spindle-cells as consisting of fibrils running spirally round the plasmatic axis. Like Ballowitz, he referred the figure of quadratic or rhombic arete, first describe
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