Suggestions for Laboratory and Field Work to Precede 

 Chapter Nine 



1. Examine the stem systems of an herb, a shrul), and a tree 

 and make sketches of them, preferably in the field. 



2. Field trip to study herbs, shrubs, and trees, noting the great 

 variety of forms in each group. A visit to a greenhouse will permit 

 the study of a variety of tropical species and of methods of prop- 

 agating plants. 



3. Field trip for the study of annuals, biennials, and perennials. 

 Old fields, gardens, roadsides, and woods will show a variety of 

 forms. In the case of perennials the underground parts are as 

 interesting and important as the above-ground shoots. How does 

 each of these types of plants pass the winter ? 



93 



