Introductory. 5 



periments, with descriptions of many useful and practicable 

 methods. 



MacDougal's " Nature and Work of Plants." (The Macmillan 

 Co., New York and London. 1900.) A simple discussion of 

 the general anatomy and physiology of seed plants, with direc- 

 tions for experiments and observations. 



SELECTED COURSES. 



The requirements and facilities of schools are so widely dif- 

 ferent that it is impossible to prepare a book for the laboratory 

 exactly suitable for all of them. The attempt has been made 

 to give methods of treatment of the easily demonstrable 

 phases of the subject in the following pages, from which 

 courses of work suitable for the needs of individual schools or 

 students may be chosen. The following groups of experiments 

 have been selected for such courses : 



COURSE i. 



Suitable for twelve laboratory periods. Carry out experiments 

 described under the headings given below, and read remainder of 

 book, also the references given above. 



Elongation of dicotyledonous stems, i. 

 Growth of leaves, 8, 10, n. 

 Germination of pollen cells, 33. 

 Germination of peas, 36. 

 Osmose in plant tissues, 45. 

 Bleeding, 51, 52. 



Estimation of amount of water transpired, 65. 

 Passage of sap, 70, 71. 

 Composition of the body, 78, 79. 

 Exhalation of oxygen by green plants, 93. 

 Changes produced in the air by a flame and by green plants, 

 96. 



