. The mechanistic conception of life; biological essays. Life; Biology. Fia. 39 Fia. 40 Fig. 41. Fig. 42 Fig. 43 Figs. 39-43.—Membrane formation and subsequent cytolysis of the sea- urchin egg in a weak solution of saponin in sea-water. Camera drawings from nature. Fig. 39, unfertilized egg at the beginning of the experiment. In this condition the egg was put into sea-water containing a small amount of saponin. The following figures show the changes it underwent in this solution. Fig. 40, membrane formation under the influence of saponin, eight minutes later. If the egg is taken out of the sap
. The mechanistic conception of life; biological essays. Life; Biology. Fia. 39 Fia. 40 Fig. 41. Fig. 42 Fig. 43 Figs. 39-43.—Membrane formation and subsequent cytolysis of the sea- urchin egg in a weak solution of saponin in sea-water. Camera drawings from nature. Fig. 39, unfertilized egg at the beginning of the experiment. In this condition the egg was put into sea-water containing a small amount of saponin. The following figures show the changes it underwent in this solution. Fig. 40, membrane formation under the influence of saponin, eight minutes later. If the egg is taken out of the saponln-sea-water in this stage, washed and put into a hypertonic solution for about one half-hour, it will develop into a larva, after it is put back into normal sea-water. If, however, it is left in the saponin solution it imdergoes the rapid cytolysis represented in Figs. 41, 42, and 43. In the above drawing of the egg, cytolysis began at G, Fig. 41, five minutes after the membrane formation. The stages represented in Figs. 42 and 43 were reached a few minutes later. cytolysis of the egg occurs) out of the sea-water containing saponin and free them from all traces of saponin by wash- ing them repeatedly with sea-water, they behave as if the. 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 Loeb, Jacques, 1859-1924. Chicago, University of Chicago Press
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