. The cytoplasm of the plant cell. Plant cells and tissues; Protoplasm. B as ergastome. The terms cytosomes and cytome were first created by P. A. Dangeard to replace those of spherosomes and spherome, which were applied to the lipide granules in question here. This writer, perceiving later that, as well as these granules, there also exist chondriosomes, whose reality up to then he had refused to admit, substituted the above terms for those of chondrio- somes and chondriome and made the distinction, from that time on, between the cytome corresponding to the chondriome and the ergas- tome which

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. The cytoplasm of the plant cell. Plant cells and tissues; Protoplasm. B as ergastome. The terms cytosomes and cytome were first created by P. A. Dangeard to replace those of spherosomes and spherome, which were applied to the lipide granules in question here. This writer, perceiving later that, as well as these granules, there also exist chondriosomes, whose reality up to then he had refused to admit, substituted the above terms for those of chondrio- somes and chondriome and made the distinction, from that time on, between the cytome corresponding to the chondriome and the ergas- tome which includes all the lipide granules of a cell and for which he reserved the term lipo- some. Here is the description which he gives of them (1919) : "The spherome is composed of all the microsomes. The microsomes are small, very refractive sphero- somes of a fatty appearance which blacken more or less with osmic acid." P. A. Dangeard, contrary to our judgment, maintained that it is the microsomes, with the ele- ments of the vacuome, which rep- resent what the cytologists had for a long time been calling chondriosomes. At the present time, Dangeard seems to have re- nounced this opinion. KOZLOW- SKI also confused these same granules with the chondriosomes. After observing only living mate- rial, he maintained that plastids arise by simple agglomeration of these granules. Reserve lipides which are found in many cells appear, in the cytoplasm, like the microsom.es which we have just been discuss- ing but are present in much great- er quantity. In endosperm cells of the castor bean for example, at the period immediately preceding the maturation of the seed, there are seen to form abruptly in the cytoplasm, numerous small granules comparable to those which normally exist in every cell and which present the same histochemical characteristics. These finally fill the cytoplasm com- pletely and then fuse into large lipide globules. In the cytoplasm of some filaments of Saprolegn