The Journal of experimental zoology . way as the experi-ments in which the heat-sterilized sea-water was used. Twofragments are shown in Fig. 12a and 12b. One piece was cutinto sections. The cytological characters of the cytasters weresimilar to those of Fig. 8. From this experiment it will be seen that the formation of thecytaster is entirely due to*the action of CaClj. C. Enucleated Fragments Treated ivith the MgCU Solution, Heat-Sterilization. An enucleated fragment was put in the MgCL solution usedby Morgan ( per cent of MgCl, in the sterilized sea-water).When I examined this frao-ment

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The Journal of experimental zoology . way as the experi-ments in which the heat-sterilized sea-water was used. Twofragments are shown in Fig. 12a and 12b. One piece was cutinto sections. The cytological characters of the cytasters weresimilar to those of Fig. 8. From this experiment it will be seen that the formation of thecytaster is entirely due to*the action of CaClj. C. Enucleated Fragments Treated ivith the MgCU Solution, Heat-Sterilization. An enucleated fragment was put in the MgCL solution usedby Morgan ( per cent of MgCl, in the sterilized sea-water).When I examined this frao-ment after half an hour a clear area 302 ISfaohide Tatsu, had been developed to a fairly large size. (Fig. 13a.) Thenucleated half of the same egg was stained and the mitotic figurewas found intact. (Fig. 13b.) The enucleated fragment wascut into sections. The general character of the cytoplasm isvery similar to that of Fig. 7, while the large aster (Fig. 14a) atthe center shows totally diflPerent features from any other that J2 a 12 b X. I^a 13 b

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Keywords: ., bookauthorwi, bookcentury1900, bookdecade1900, booksubjectzoology