The Journal of experimental zoology . 154 Edivin G. Cotiklin. after cleavage begins it can scarcely be doubted that their poten-cies are also the same. Hundreds of experiments involving manythousands of eggs were made upon the various cleavage methods of experimenting which I employed were essentiallylike those used by Driesch and Crampton, viz: the eggs in the2-cell, 4-cell, 8-cell or later stages were strongly spurted with apipette, or were shaken in a vial, and thereby some of the blasto-meres were frequently injured while others were uninjured andcontinued to develop. The
The Journal of experimental zoology . 154 Edivin G. Cotiklin. after cleavage begins it can scarcely be doubted that their poten-cies are also the same. Hundreds of experiments involving manythousands of eggs were made upon the various cleavage methods of experimenting which I employed were essentiallylike those used by Driesch and Crampton, viz: the eggs in the2-cell, 4-cell, 8-cell or later stages were strongly spurted with apipette, or were shaken in a vial, and thereby some of the blasto-meres were frequently injured while others were uninjured andcontinued to develop. The injured blastomeres were rarelykilled, as was shown by the fact that they remained transparentand entire for a day or more, whereas dead cells soon becomeopaque and disintegrate. These injured cells never again divideand sections show that their nuclei are frequently broken andtheir chromosomes scattered. Cells are more likely to be injuredduring nuclear division than during rest. The fact that theseinjured cells never again divide though
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Keywords: ., bookauthorwi, bookcentury1900, bookdecade1900, booksubjectzoology
