. Lessons in botany. Botany. THE LIVING SUBSTANCE OF PLANTS. 21 the axis of the cell in some species; or triangular, or quadrate in others. This is the nucleus. Around the nucleus is a granular layer from which delicate threads of a shiny granular substance radiate in a star-like manner, and terminate in the chlorophyll band by one of the groups cf starch grains. A granular layer of the same substance lines the inside of the cell wall, and can be seen through the microscope if it is properly focussed. This granular substance in the cell is protoplasm. 44. Cell-sap in spirogyra.—The greater par
. Lessons in botany. Botany. THE LIVING SUBSTANCE OF PLANTS. 21 the axis of the cell in some species; or triangular, or quadrate in others. This is the nucleus. Around the nucleus is a granular layer from which delicate threads of a shiny granular substance radiate in a star-like manner, and terminate in the chlorophyll band by one of the groups cf starch grains. A granular layer of the same substance lines the inside of the cell wall, and can be seen through the microscope if it is properly focussed. This granular substance in the cell is protoplasm. 44. Cell-sap in spirogyra.—The greater part of the interior space of the cell, that between the radiating strands of proto- plasm, is occupied by a watery fluid, the " ; Demonstration 7. 45. Test for protoplasm in spirogyra.—Mount a few threads of spirogyra in a drop of weak solution of iodine for microscopic Fig. 9. Cell of spirogyra before treat- ment with 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 Atkinson, George Francis, 1854-1918. New York, H. Holt and company
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