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35 per cent aeration alpine amount batteries calories calorimeter Clarkia elegans CLEMENTS closed curves decimeter per hour decrease diameter dry weight effect of wind epidermis four holards free phytometers given in table grams per square graphically in figure Helianthus annuus illium increase lath-houses leaf area LIGHT HOLARD light values loam lower m.p.h. wind maximum measurements mesophyll miles per hour number of leaves obtained Open Open Open oven palisade cells pellets period phytometer method Pike's Peak protoplasm radiant energy radiation intensity rate of transpiration rH CM rH rH rH Santa Barbara seeds set of plants shade soil temperature square decimeter stem height stomata stomatal openings test set tion torsion balance total transpiration transpiration rate turgor water content water loss water requirement weeks wet and dry wilted wind velocity WIND WIND xylem