. Botany for high schools and colleges. Botany. CELL FORMATION BT DIVISION. 39 (a) The foregoing must suflBce as examples of Fission. It occurs tlirougbout the vegetable kingdom and may be regarded as the great aieans by which cells are multiplied. (6) The cambium zone of Dicotyledons may be examined very profit- ably by the student. If a tliin cross-section of a stem be soaked for a short time in a carmine solution, the protoplasm of the cambium zone will be colored, and the newly formed partitions made thus more distinct. (c) The ends of young roots are valuable for study ; longitudinal sec-
. Botany for high schools and colleges. Botany. CELL FORMATION BT DIVISION. 39 (a) The foregoing must suflBce as examples of Fission. It occurs tlirougbout the vegetable kingdom and may be regarded as the great aieans by which cells are multiplied. (6) The cambium zone of Dicotyledons may be examined very profit- ably by the student. If a tliin cross-section of a stem be soaked for a short time in a carmine solution, the protoplasm of the cambium zone will be colored, and the newly formed partitions made thus more distinct. (c) The ends of young roots are valuable for study ; longitudinal sec- tions of these should be made, and treatedias in the previous case. (rf) Another interesting study of a special kind of fission may be taken up in an examination of the development of stomata. (See p. 99.) (e) Tliat slight variation of fission, which has sometimes been called budding, may be very easily studied in the Yeast Plant (Saccharomyces â¢cerevisice).* The conidia, stylospores, and basidiospores of many fungi, which are more diflftcult to study, are very instructive examples of this va- riety of fission. Conidia may be studied in Oystopus; stylospores in the Red Rust of tlie grasses (the so- called uredo-stage of Puccinia gram- inia) ; and basidiospores iu young toadstools (Agaricus). rri, v J- T>1 4- f V -^'S' 29.âThe Yeast Plant, Saccharo- 51.â Xlie xeast Jrian'C \OCtC- myces- cerevisice. rt, rounded cells 7 â âââ ..â â/â\ 4',n.,.v,icl,^c. from " bottom yeast," 60 hours after charomyces cerevisim) larnislies sowing in beer-wort; », row of ovai a yery simple example of Inter- f^, 'S :Xl^\:. I'X^ft nal Cell-Formation. Under ca^t four ceii^s^foâ¢^ certain conditions the cells grow <^*?f"«'":''?"*i " ""* * x ^"O'" """^ '^ X tuUiâAlter xCsims. to a larger size than usual; their protoplasmic contents divide into, generally, four parts (two to four, according to Sachs), each of which
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1888
