Contents. 



94. Portion of spectrum by aid of wliicli green plants exhale 



oxygen ....... 



95. Relations of plants and animals to the atmosphere 



96. Changes produced in the air by a flame and by green plants 



97. Formation of starch in light . 



98. Relation of stomata to food formation . 

 gg. Nutritive relations of a parasite . 



100. Symbiosis of a seed plant and a fungus 



loi. Tubercles of leguminous plants . 



102. Nutrition of a saprophyte 



go 



91 

 92 



94 

 95 

 96 



97 

 97 



VI. Respiration, Digestion, and Fermentation. 



103. Release of energy ....... 



104. Exhalation of carbon dioxide by germinating peas 



105. Estimation of the amount of carbon dioxide given off 



piration of germinating wheat . 



106. Incomplete oxidation of oily seeds 



107. Respiration without external oxygen 



108. Influence of temperature upon respiration 

 log. Products of fermentation 

 no. Influence of various factors on fermentation 



111. Action of diastase and associated enzymes 



112. Digestive action of scutellum of corn 



113. Digestion of cellulose .... 



114. Catalase and other oxidizing enzymes . 



115. Translocation of food material 



116. Translocation of carbohydrates from leaves 



117. Excretion of nectar .... 



118. Action of glandular hairs 



119. Secretions serving as a protection. 



VII. Stimulation and Correlation 



120. General irritability of plants 



121. Sensory organization of the plant . 



122. General reactions of a plant to light 



123. Prophototropism .... 



124. Diaphototropism .... 



125. Perceptive region in leaves of grasses 



100 



loi 



102 

 103 

 103 

 104 

 105 

 105 



105 

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 109 

 no 



112 

 112 

 113 



114 

 114 

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