A laboratory course in plant physiology, especially as a basis for ecology; . igure, this arrangementallowing its removal. Both stage and box taper forward to one inch andone and one-half inches respectively in breadth, a feature not necessarybut useful as diminishing the leverage of the box when full. A battery-clamp, properly filed, holds the apparatus to the stage of the microscope,while a mat of felt between prevents conduction of heat to or from theinstrument. A bent thermometer, as shown in the figure, may be used,but the straight ones needed in the laboratory for other purposes areabout
A laboratory course in plant physiology, especially as a basis for ecology; . igure, this arrangementallowing its removal. Both stage and box taper forward to one inch andone and one-half inches respectively in breadth, a feature not necessarybut useful as diminishing the leverage of the box when full. A battery-clamp, properly filed, holds the apparatus to the stage of the microscope,while a mat of felt between prevents conduction of heat to or from theinstrument. A bent thermometer, as shown in the figure, may be used,but the straight ones needed in the laboratory for other purposes areabout as good. To raise the temperature, the box is nearly filled withwater and heated by a spirit-lamp ; to lower it, the box is gradually filledwith ice and salt.* * Very careful tests of the accuracy of this stage have been made in comparison PLANT PHYSIOLOGY. Temperature-stages may be purchased at prices from $ forms are figured in Goodales Physiology, page 202, in , in Verworn, 392. Very elaborate forms have been devised for FIG. 8.—TEMPERATURE-STAGE AND the true size. 10. What effect is produced upon Protoplasm, as manifested inits rate of movement, by presence or absence of light, and by varia-tions in its intensity? Answer from the results of simple experiments inventedby yourselves (call them Experiment 2). />Y careful to avoid t/ic influence of variations in Jieat. with other forms, with the result that it is found to be at least as accurate as any ofthose made on the principle of warming a metal plate (while superior to most of themis the ease and convenience with which temperatures may be reduced to zero), andnearly, if not quite, as accurate as those using a circulation of hot water. THE STRUCTURE AND PROPERTIES OF PROTOPLASM. 57 11. What effect is produced upon Protoplasm, as manifested inits rate of movement, by electrical currents? Answer by Experiment 3. EXPERIMENT 3. To determine this, it i
Size: 1704px × 1466px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., boo, bookcentury1900, bookcollection, bookdecade1900, bookyear1901
