Archive image from page 169 of The cytoplasm of the plant. The cytoplasm of the plant cell cytoplasmofplant00guil Year: 1941 Guilliermond - Atkinson 154 — Cytoplasm Rather often, there are normally found in the vacuoles more or less large, spherical bodies, or small granules united in mul- berry-shaped masses, which are the result of a partial precipita tion of the colloidal solution within the vacuoles. These bodies stain with vital dyes which, at the same time, bring about other precipitates of the same or of different natures. The normal pres- ence of these bodies in the vacuole could be
Archive image from page 169 of The cytoplasm of the plant. The cytoplasm of the plant cell cytoplasmofplant00guil Year: 1941 Guilliermond - Atkinson 154 — Cytoplasm Rather often, there are normally found in the vacuoles more or less large, spherical bodies, or small granules united in mul- berry-shaped masses, which are the result of a partial precipita tion of the colloidal solution within the vacuoles. These bodies stain with vital dyes which, at the same time, bring about other precipitates of the same or of different natures. The normal pres- ence of these bodies in the vacuole could be explained by the fact that the colloidal micelles contained in the vacuoles in some cases do not possess a power of unlimited imbibition, so a time seems to come when they cease to take in water. A disturbance in equi- librium occurs and this leads to the production in the vacuolar sap of a coacervate. It may be added that rather frequently the large vacuoles of mature cells, especially when they contain tan- nins, continue to enclose a very concentrated so- lution and in living material are exceedingly refractive. These vacuoles which seem to be in the state of a jelly do not form precipitates with vital dyes or else form them with great difficulty. In the latter case they show an intense homo- geneous color. There are even cases in which the jelly is almost solid and in such cases it becomes very difficult to plasmolyze the cells, as is seen in the vacuoles of the pericarp of Ilex Aquifolium (Guilliermond, Chaze). Vacuoles behave differently according to the nature of their contents. The development of the vacuolar system which we have just described is of very general occur- rence and has been observed in very widely sep- arated plants (phanerogams: P. A. Dangeard, Guilliermond, P. Dangeard, Bailey, Zirkle and others; pteridophytes: Emberger). All the vacuoles of the higher plants however, do not follow exactly this development. Thus, in studying the formation of the vacuo
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