xii GENERAL BIOLOGY 



PRACTICAL EXERCISES. 

 Study 37. Observations on cell divisions and on maturation of sex cells, 



P- 305- 



Study 38. Observations on parthenogenesis, p. 306. 

 Study 39. Observations on the relation between fecundity and nurture ', 



P- 325' 



CHAPTER V. 



THE LIFE CYCLE. 

 I. ALTERNATION OF GENERATIONS, p. 330. 

 II. SPECIAL METHODS OF ASEXUAL REPRODUCTION, p. 331. 



III. CHANGE OF FORM WITH ALTERNATION OF HOSTS, p. 340. 



IV. METAMORPHOSIS, p. 342. The transformations of insects, p. 



343. Internal metamorphosis, p. 347. 



V. ARTIFICIAL DIVISION AND COMBINATION OF ORGANISMS, p. 353. 

 Regeneration, p. 353. Grafting, p. 360. 



PRACTICAL EXERCISES. 



Study 40. Observations on asexual reproductive methods, p. 337. 

 Study 41. External metamorphosis in insects, p. 346. 

 Study 42. Observations on internal metamorphosis, p. 351. 

 Study 43. Experiments with regeneration in planarians, p. 360. 

 Study 44. Grafting practice with plants, p. 363. 



CHAPTER VI. 



THE ADJUSTMENT OF ORGANISMS TO ENVIRONMENT. 

 I. ADJUSTMENT IN PLACE AND TIME, p. 369. i. Local distribu- 

 tion of green plants 2 . Hibernation and aestivation, p. 3 7 6 . . 

 3. Local distribution of animals, p. 378. 4. Pond life, p. 



385. 



II. ADJUSTMENT IN MANNER OF LIFE, p. 390. i. Symbiosis, p. 

 390. 2. Parasitism, p. 396. 3. Pollen distribution, p. 400. 

 III. ADJUSTMENT IN FORM AND APPEARANCE, p. 404. i. The re- 

 adaptation of insects to aquatic life, p. 407. 2. Phylogenetic 

 adaptation in diving beetles, p. 415. 3. Animal coloration, 

 p. 422. 



PRACTICAL EXERCISES. 

 Study 45. Woodland plant society, p. 373. 



Study 46. Observations on the dessication and resuscitation of rotifers, 

 P- 378. 



