Image d'archive à partir de la page 96 du cytoplasme de l'usine. Le cytoplasme de la cellule végétale cytoplasmofplant00guil Année : 1941 81 Chapitre VIII - L'Ghondriome {suite) Le matériau très beot pour l'étude de la vie cytoplasme est d'être trouvés dans les cellules épidermiques de fleurs et divers organes de la monocotylédone, ceux d'Iris et tulip entre autres, ainsi que dans l'ampoule d'Allium cepa, qui sera reprise plus tard, et dans les Saprolegniaceae qui viennent d'être étudiés. Sur ces formulaires, nous avons été en mesure de faire les observations les plus précises de l'chondriosomes qu'il a été poss

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Archive image from page 96 of The cytoplasm of the plant. The cytoplasm of the plant cell cytoplasmofplant00guil Year: 1941 Chapter VIII 81 — The Ghondriome {cont'd) The very beot material for the study of living cytoplasm is to be found in the epidermal cells of flowers and various organs of the monocotyledons, those of Iris and tulip among others, as well as in the bulb scales of Allium Cepa, which will be taken up later, and in the Saprolegniaceae which have just been studied. On these forms we have been able to make the most accurate observations of the chondriosomes that it has been possible to make up to the present time. We have been able to show, by a comparison of these observa- tions with those on fixed and stained cells, that the mitochondrial methods preserve the cytoplasm and its morphological constituents, the chondriosomes and plastids, in a manner as faithful to the form they present in life as it is possible to have it done. These observations permitted us, also, to specify the histo- chemical and histophysical characters of the elements. This will be taken up later. We have studied the chondriome very accurate- ly during the formation of the embryo sac and of pol- len grains in the Liliaceae and, in particular, in Lili- um candidum. In the young ovary, all the cells of the nucellus present a chondri- ome made up of a mixture of chondrioconts and of mitochondria. The embryo sac, which arises from a cell of the nucellus, first shows a chondriome simi- lar to that of other cells of the tissue, then, in the course of its differentiation, at the mo- ment when synizesis begins, it is observed that a part of the chondrioconts thicken and form small swellings on their long axes. These grow little by little, often detach themselves from the chon- driocont in which they rise by rupture of the thin portions which connect them, then enlarge greatly, and take on a crystalline ap- pearance. This seems to be due to the production in their interior of protein c

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