A laboratory course in plant physiology, especially as a basis for ecology; . dry bulbapparatus frequently observed, will do. There are several forms ofsunshine-recorder, but for most purposes an approximate record tracedby some student for the class upon a thermograph sheet kept besidehim for the purpose is sufficient. All of these records should be plottedupon the sheet with the Transpiration curve. There are several other methods of investigating transpiration, ofwhich one of the most practicable is the measuring method describedby Detmer (page 217). A very simple and ingenious method of de
A laboratory course in plant physiology, especially as a basis for ecology; . dry bulbapparatus frequently observed, will do. There are several forms ofsunshine-recorder, but for most purposes an approximate record tracedby some student for the class upon a thermograph sheet kept besidehim for the purpose is sufficient. All of these records should be plottedupon the sheet with the Transpiration curve. There are several other methods of investigating transpiration, ofwhich one of the most practicable is the measuring method describedby Detmer (page 217). A very simple and ingenious method of demon-strating transpiration and intercellular aeration together is given byNoll in Flora, 86, 386. Very useful for some purposes are potometers,several forms of which are described by Darwin and Acton. A verypracticable form is described by MacDougal in the Botanical Gazette,24, 110. A modification of this, which I have found very efficient, isshown in Fig. 15. A T-tube is bent into the form shown by thefigure and attached by a water-tight joint to a large-bore thermometer-.
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