A manual of physiology : for the use of junior students of medicine / by Gerald F. Yeo.
- Date:
- 1884
Licence: Public Domain Mark
Credit: A manual of physiology : for the use of junior students of medicine / by Gerald F. Yeo. Source: Wellcome Collection.
Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.
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![all, however, modificatioiis of the same general j^lan. The first is that by the formation of a hud from the side of the parent cell; this bud then increases in size, and finally separates from the parent and becomes a separate individual. This process, which is called gemmation, can Fig. 36.—Cells of the yeast-plant in process of budding, be- tween -which are some bac- teria. Fic ]7.—Cartilage from young animal showing the division of the cells {a, i, c, d). readily be seen in all its stages in gi yeast, where the torula cells have various-sized buds growing from them. If the budlike X^rotrusion be large, nearly equal in size to the cell itself, the process receives the name of fission, or division. In well marked typical fission the parent cell divides into two parts of equal size, each of which becomes a perfect individual. Various gradations may be traced between the two processes, so tliat it is difficult to draw any very distinct line be- 2 3 ^-Jx-^ tween budding and fission. The budding and fission may be multiple ; many buds and several units, pro- ducts of division, may remain together, and lorni what is called a colony. When this multiple budding or division takes place, so that the new units are included within the body of the parent cell, then the process is called endogenous reproduction or spore formation. As in the gradations between budding and fission, so it is difficult to draw a hard and fast line between what may be called multiple fission and sjoore formation. Fi . .SS.—Cells of a fungus {Glaorapsa) showing dif- ferent stage (1—4) of endogenous division. (After Sachs.)](https://iiif.wellcomecollection.org/image/b21932943_0078.jp2/full/800%2C/0/default.jpg)
