286 Principles of Plant Culture. 



the root-hairs in potted plants. Emphasize the differ- 

 ence between root hairs and root branches. 



Effects of transplanting on root branching (104). 

 Study young plants of lettuce, tomato, cabbage, etc., 

 that have been pricked off, and compare their roots 

 with those of others that have not been pricked off. 



Relation of roots to food supply (111). Plant seeds 

 of the radish in saucers containing clean sand and pot- 

 ting soil respectively, and when the seedlings have at- 

 tained some size, wash out and examine the roots in 

 the two soils. 



Boot tubercles (112). Study the roots of young 

 clover plants of various ages, and note how early in the 

 development of the plant the tubercles are discernible. 



Underground stems (114). Study the development 

 of the potato plant from growing specimens, noting the 

 points at which the tuber-bearing stems originate, and 

 the marked difference between these and the roots. 



Nodes and internodes (115). Observe the nodes in 

 the stems of many plants, noting the relation of the 

 diameter of the young stem to the length of the inter- 

 nodes; also note the undeveloped internodes near the 

 terminus of the stem. 



Buds (127). Study specimens of leaf-buds from 

 many plants, noting their structure, position, etc. 



Flower-buds (132). Study the form and location of 

 the flower-buds in many plants, particularly in fruit 

 trees. 



Parts of the flower (140). Study the parts of the 

 flower, explaining the function of each part. 



Perfect and imperfect flowers (153). Study these 

 as produced by several different plants, particularly of 

 the strawberry. 



Degree of maturity necessary to germination (162). 

 Test seeds of Indian corn, pea, tomato, etc., that were 

 gathered at varying stages of maturity. 



Seed vitality limited by age (164). Test seeds of 

 lettuce, parsnip, onion, etc., 1 year, 2 years and 5 years 

 old, respectively. 



