These surround little spherules of glass which are detached when the rock is struck with a hammer. [Please select]
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Gradually, however, the yellow sphere broke itself up into smaller spherules (Pl.) [Please select]
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Gradually the nucleus divides, and the protoplasm also separates into two spherules (Pl.) [Please select]
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The separate spherules now begin to lose their smooth outline, to throw out processes, and to show amœboid movements like those of the creatures just described. [Please select]
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