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The fertilizing cell, its varying form and behavior by Nelly Peery, 1890

The fertilizing cell, its varying form and behavior by Nelly Peery, 1890, Page 65

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63. process of division, as did the single nucleus: the next stage illustrated, in in fig 7, where the division into four nuclei is almost completed. In fig 8. this division is complete, and we have the four pollen grains, enclosed in the mother cell. In Pl. VII fig 1. is represented the mature pollen grain In fig 2. is represented the pollen grain after it has germinated, and
 
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