Introductory. 7 



Perceptive region in leaves of grasses, 125. 



Movements due to changes in intensity of illumination, 128. 



Geotropism; relation of the plant to gravity, 129, 130. 



Movements in response to shock, 137. 



Circumnutation of growing organs, 140. 



Carpotropic movements, 141, 142, 144. 



COURSE 3. 



Suitable for forty-eight laboratory periods. Readings and 

 references as above. 



Elongation of dicotyledonous stems, i. 

 Elongation of the stem of a monocotyledonous plant, 3. 

 Measurement of growth in length by auxanometers, 6. 

 Growth of leaves, 8, 10, n. 

 Growth of peduncles and scapes, 12. 

 Growth of roots, 14. 



Influence of temperature upon germinating seeds, 20. 

 Influence of sodium chloride upon germination, 26. 

 Germination of pollen cells, 33. 

 Germination of grains of corn, 34. 

 Germination of seeds of Ricinus, 35. 

 Germination and propagation of Begonia, 39. 

 Propagation by various organs, 42. 

 Osmose, 44. 



Osmose in plant tissues, 45. 

 Structure of an absorbing root, 46. 

 Tissue tensions, 49. 

 Bleeding, 51, 52. 



Measurement of exudation pressure, 53. 

 Imbibition pressure, 54. 



Amount of stretching produced by imbibition and turgidity, 

 56. 



Structure of leaves, 57, 58, 59. 



Lifting power of a transpiring branch, 64. 



