General physiology; an outline of the science of life . , Containing quietly streaming proto-plasm. B, The same cell stimulated by aninduced current. The protoplasm in thestrands has become rounded into singleglobules (c, d). (After Kiihne.) 96 GENERAL PHYSIOLOGY motion, in the second they are moving somewhat more slowly, andin the last still more slowly. Since, therefore, only a gradualdifference exists, it is impossible to establish a sharp limit. Inliving substance also there are different grades of mobility amongthe particles, , in one case the substance is like thin, in anotherca
General physiology; an outline of the science of life . , Containing quietly streaming proto-plasm. B, The same cell stimulated by aninduced current. The protoplasm in thestrands has become rounded into singleglobules (c, d). (After Kiihne.) 96 GENERAL PHYSIOLOGY motion, in the second they are moving somewhat more slowly, andin the last still more slowly. Since, therefore, only a gradualdifference exists, it is impossible to establish a sharp limit. Inliving substance also there are different grades of mobility amongthe particles, , in one case the substance is like thin, in anothercase like thick liquid. In general, it possesses the consistency andmobility of raw white of egg, but it may be firmer, and certainconstant differentiations of protoplasm may possess even the con-sistency of a soft jelly approximating a solid condition, withoutlosing, however, the power of shifting its particles. Such a condi-tion exists in muscle-fibres, flagella, cilia, the nucleus, and uponthe surface of many protoplasmic masses that do not possess a. Fig. 36.—Orbitolites. Piece of the many-chambered calcareous disc, bearing outstretched pseudo-podial filaments. A, Undisturbed. B, By strong shaking the protoplasm of the pseudopodiahas been stimulated to form globules and spindles. membrane, such as infusorian cells. The term solid is applicableto such cases only, if at all. But these cases of a more viscous con-sistency are always locally restricted within the cell; the rest ofthe cell-contents is always a thinner liquid. Finally, it should not be forgotten that within the liquid theremay be deposited all sorts of solid elements of very various con-sistencies, and that, therefore, the whole constitutes, not a homo-geneous liquid, but a mixture, or, as Berthold terms it, an this reason it appears inadmissible to speak of an aggregatecondition of protoplasm, as many observers do. Strictly speaking,the term aggregate condition can apply only to a homogeneoussubstan
Size: 2027px × 1232px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookidgen, booksubjectphysiology
