RELATIONS OF PLANTS TO EACH OTHER 211 



249. Fields. — Examine a cultivated field, and 

 note the kinds or species which exist there with the 

 crop plants. Do they belong to meadows, forests, 

 or swamps ? 



250. Course of further study. — The work followed 

 in this book will give a general idea of the mode 

 of life and purposes of the plant world. It will 

 next be in order for the student to examine the 

 structure and development of representative types 

 of the great groups in which plants are divided, 

 — algse, fungi, liverworts, mosses, ferns, and seed 

 plants, — in order to comprehend their descent and 

 relationship, and the general laws by which plants 

 adapt their bodies to their environment. 



