. The plant, an illustration of the organic life of the animal. Biology. 40 THE TISSUES' OP PLANTS of plane surfaces, as for instancfe, when they assume a cylindrical or retain their spherical form, it is evident that the walls of contiguous cells will only come into contact at certain points of their surface, and that triangular spaces will be left between the cells. These intercellular passages are beautifully apparent between the cylindrical cells which constitute the pith of the stem of Anemone Pennsylvanica, and afford the most satisfactory proof that these cells do not form a continuous
. The plant, an illustration of the organic life of the animal. Biology. 40 THE TISSUES' OP PLANTS of plane surfaces, as for instancfe, when they assume a cylindrical or retain their spherical form, it is evident that the walls of contiguous cells will only come into contact at certain points of their surface, and that triangular spaces will be left between the cells. These intercellular passages are beautifully apparent between the cylindrical cells which constitute the pith of the stem of Anemone Pennsylvanica, and afford the most satisfactory proof that these cells do not form a continuous and homogeneous mass, but are in reality separate cavities^ aggregated together and communicating with each other through their contiguous walls. Pig. riangular intercellular canals between the cylindrical cells of Anemone Pennsylvanica. In some instances) however, cells which are hexagonal in outline form intercellular passages, and this in a manner so interesting that it demands a particular description. If a section of the young petiole of Sparganium ramosum be placed beneath the microscope, a number of triangular apertures, known to botanists as lacunae, will be seen; these are evidently the result of certain notches in the cell walls, which correspond with those in the walls of contiguous cells. As growth progresses these notches become deeper. The lacunae, a, a, a, (Fig. 9,) enlarge at the expense of the area enclosed by the cells, until at length the cells. 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 Coultas, Harland, d. 1877. Philadelphia ; Perry and Erety
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