. Ameboid movement. Amoeboid movement; Amoeba. AMEBOID MOVEMENT 69 the amount of ectoplasm in the process of forming at an}^ given moment could be compared with a similar relation existing in discoides, to see whether these respective ratios were propor- tional to the speed of the moving surface films in the two amebas. As it is, the irregularity of form of sphaeroniicleosus makes such computation subject to the possibility of considerable error. In discoides however the problem is comparatively simple. I there- fore did not go into this matter extensively, but merely worked out the relations
. Ameboid movement. Amoeboid movement; Amoeba. AMEBOID MOVEMENT 69 the amount of ectoplasm in the process of forming at an}^ given moment could be compared with a similar relation existing in discoides, to see whether these respective ratios were propor- tional to the speed of the moving surface films in the two amebas. As it is, the irregularity of form of sphaeroniicleosus makes such computation subject to the possibility of considerable error. In discoides however the problem is comparatively simple. I there- fore did not go into this matter extensively, but merely worked out the relations mentioned in one case, and I mention it here to illustrate the method rather than to record the result, which is not to be taken as very exact. Since the movement of the surface film is obviously a surface phenomenon, only the surfaces of the amebas need to be taken into account. In Figure 28 is illustrated a discoides of such a shape as to allow a fairly accurate computation of its Figure 28. A clavate Amoeba discoides, showing the amount of ecto- plasm that is constantly being made at the anterior end. Length of the ameba, 310 microns. Three outlines of the anterior end only are given; the rear por- tion of the ameba remained approximately the same size and shape in the three outlines. The cross lines at the anterior end divide the forming ectoplasm of the ameba from the formed. As will be noticed the cross lines are drawn through the intersections of two successive outlines. Computing the areas on both sides of the cross lines for the two outlines and averaging them, there is found a ratio of i to 10; one-eleventh of the total surface repre- sents forming ectoplasm, and ten-elevenths formed ectoplasm. (One-twenty-second of the total surface was deducted for surface. 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 t
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Keywords: ., bookcentury1900, bookdecade1920, bookpublisherprinc, bookyear1920
