. The cytoplasm of the plant cell. Plant cells and tissues; Protoplasm. Guilliermond - Atkinson Cytoplasm an enormous single vacuole which occupies the greater part of the cell, forcing the nucleus to the periphery. This vacuole is often traversed by thin cytoplasmic trabeculae which radiate from the nucleus to join the parietal cytoplasm. Lipide granules are encountered in almost all, if not in all, cells. They are scattered in the cytoplasm in more or less consid- erable numbers according to the cells and their stage in develop- ment. One also finds, moreover, various inclusions in the cyto-
. The cytoplasm of the plant cell. Plant cells and tissues; Protoplasm. Guilliermond - Atkinson Cytoplasm an enormous single vacuole which occupies the greater part of the cell, forcing the nucleus to the periphery. This vacuole is often traversed by thin cytoplasmic trabeculae which radiate from the nucleus to join the parietal cytoplasm. Lipide granules are encountered in almost all, if not in all, cells. They are scattered in the cytoplasm in more or less consid- erable numbers according to the cells and their stage in develop- ment. One also finds, moreover, various inclusions in the cyto- plasm: reserve or by-products formed during cellular activity (starch grains, crystalline proteins, various crystals, etc.) which are localized either in the cytoplasm itself or in the plastids or in the vacuoles. All these substances, however, are only transitory products formed during cytoplasmic activity. The paraplasm:- We now turn to a new consideration. It has just been seen that in the cytoplasm there are in suspension some elements which are always present such as plas- tids, chondriosomes, vacuoles and lipide granules. Among these elements, a distinction must be made between those wiiich can be considered as belonging to the living substance, to the architecture of the cell, and those which simply re- sult from its activity. Among the lat- ter whose chemical composition is more simple, there are some, like the starch grains, which form in the plastids, others, like many crystals, which are lo- calized in the vacuoles, others still, like the crystalline proteins, which are con- tained in the cytoplasm itself. Now, the cytoplasm is a substance which continues to exist permanently. It presents a chemical composition still not well known but which does not vary appreciably. It is a living substance. The plastids are elements which are never formed de novo but, like the nucleus, are transmitted by division from cell to cell. They, therefore, may also be considered as livin
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