. Minute marvels of nature, being some revelations of the microscope, exhibited by photomicrographs taken by the author. Natural history; Microscopes. 98 MINUTE MARVELS OF NATURE amongst which the nuclei or hving centres of the grains exist. Of the layers of tissue which con- stitute the cell-wall of each erain, the botanist. Fiy. 62. Sections of pollcn-graiiis of the mallow Hower, showinR that the microscopic granules possess the characteristics of vegetable cells terms the outer layer the "extine," and the inner the "; When a pollen-grain reaches the stigma the vis
. Minute marvels of nature, being some revelations of the microscope, exhibited by photomicrographs taken by the author. Natural history; Microscopes. 98 MINUTE MARVELS OF NATURE amongst which the nuclei or hving centres of the grains exist. Of the layers of tissue which con- stitute the cell-wall of each erain, the botanist. Fiy. 62. Sections of pollcn-graiiis of the mallow Hower, showinR that the microscopic granules possess the characteristics of vegetable cells terms the outer layer the "extine," and the inner the "; When a pollen-grain reaches the stigma the viscid Huid which the latter secretes causes a kind of germination to take place, and through certain weak places in the extine layer the intine begins to bulge and gradually forces a way through, assuming the form of a little tube, which increases in length in a very wonderful way,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ward, John J. New York, T. Y. Crowell and Co.
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