Laboratory and field manual of botany . ittle water to each, so that the hydran-gea will begin to droop, and see whether this changes the relative amount oftranspiration for the two plants. Vary the conditions of the experiment fora day or two as regards temperature, and again for a day or two as regardslight, and note the effect upon the amount of transpiration. The structure of the Ficiis (India-rubber plant) leaf has already beenstudied. That of the hydrangea is looser in texture and more like the leafof the lily. leaves, make blue prints of them, cut these out, and weigh them. The total ar
Laboratory and field manual of botany . ittle water to each, so that the hydran-gea will begin to droop, and see whether this changes the relative amount oftranspiration for the two plants. Vary the conditions of the experiment fora day or two as regards temperature, and again for a day or two as regardslight, and note the effect upon the amount of transpiration. The structure of the Ficiis (India-rubber plant) leaf has already beenstudied. That of the hydrangea is looser in texture and more like the leafof the lily. leaves, make blue prints of them, cut these out, and weigh them. The total areamay easily be calculated by comparison of the weight obtained with that of aknown area of the paper used. 1 It will be much more convenient to tie tlie liydrangea, if one has been chosenthat has but a single main stem. Instead of the hydrangea the common (dneraria,Stnecio , or a small suntlower plant does very well. 2 The addition of known amounts of water may be made most conveniently bymeasuring in a cylindrical hydrangea potted in abattery jar for Exp. XXXVIII kim: of w a tkk 63 WliiU li;;ht docs the sLriicLuiv mi (he results of the preceding (XpClillHIlt . l\i:ri:iii:NCKs. Detiuer-Moor,.» ; (laiKHiir, 1<*. EXPERIMKXI XXXIX Passage of water from stem to leaf. Ilacc m fnslily cut Icafvshoot of some plant with large, thin leaves, sudi as Uijili-aiviniIlortensid, in eosin solution for a few minutes. As soon as tin*leaves show a decided reddening pull soiiu^ of them off andsketch the red stains on the scars thus made. What does tliisshow ? EXlKKLMKXT XE Rise of water in leaves.* * Tut the freshly cut ends of tlupetioles of several tliin leaves of different kinds into small glasses,each containing eosin solution to the depth of one quarter inch oi-more. Allow them to stand for half an hour, and examine themby holding up to the light and looking through tliem to see intowhat parts the eosin solution has risen. Allow some of the leavesto remain as
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