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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 66

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64. shows the peculiar, irregular, twisted tube, with its two nuclei. * In many cases even when the pollen grain reaches the pistil it meets another difficulty which it must surmount. Often the ovary can only be reached by passing through the long narrow tube of the style, as in many angiosperms, This is advantageous only in view of the increased protection afforded *See page 69.