66 



BIOLOGY FOR BEGINNERS 



pp. 27-32; Lessons in Botany, Atkinson, p. 108; Textbook of Botany, 

 Bessey, pp. 194-196; Nature and Work of Plants, pp. 38-39, 74; Natural 

 History of Plants, Kerner and Oliver, Vol. I, Part 1, pp. 88-90; Textbook 

 of Botany, Strasburger, p. 254. 



HYDROTROPISM 



Plant Relations, Coulter, pp. 89-93; Plant Structures, Coulter, pp. 307- 

 309; Elementary Botany, Atkinson, p. 90; Natural History of Plants, 

 Kerner and Oliver, Vol. I, Part 2, p. 775; Physiological Botany, Gray, 

 pp. 393-394; Textbook of Botany, Strasburger, pp. 261-280; Textbook of 

 Botany, Stevens, p. 102. 



OSMOSIS 

 (See references at end of Chapter LIII.) 



SUMMARY 

 Necessity of water. 



1. Food. 



2. Transportation of food, mineral matter, etc. 

 Transportation of oxygen. 

 Transportation of waste. 



3. Turgescence. 



Meaning of term. 

 Where it is active. 



Importance, in absence of woody support. 

 Osmosis. 



1. Definition. 



2. Processes dependent upon osmosis: 



Absorption 



Assimilation 



Digestion 



Respiration 



Excretion 



(Diagram of root hair of experiment) 

 Root hairs. 



Structure (see diagram). Location back of tip. 

 Adaptations for absorption. 



