Appendix Syllabus of Laboratory Work. 273 



planted on several successive days, beginning at least 10 

 days in advance. 



Not all seeds should be deeply planted (48). Plant seeds 

 of the bean, pea, Indian corn and wheat in 6-inch flower 

 pots, at three different depths, viz., ^ inch, 3 inches and 

 6 inches from the bottom; place the pots in a warm 

 place for 3 weeks, after which carefully remove the soil, 

 noting the germination of the seeds in the different 

 layers. 



Vigor ofplantlet proportionate to size of seed (49). Plant 

 large and small specimens of navy beans by themselves, 

 in greenhouse saucers, and permit them to germinate. 

 The smaller seeds usually germinate earlier than the 

 larger, but they produce more slender plantlets, which 

 soon fall behind the others in development. 



Plantlet visible in the seed (54). Boil samples of various 

 kinds of seeds until they are fully swollen, after which 

 require the students to dissect them and to seek out the 

 plantlets. Lenses, needles and forceps are very useful 

 in this work. 



The cotyledons a storehouse for food (60). Eemove the 

 cotyledons of some bean plantlets growing in a flower 

 pot or saucer, leaving those of other plantlets intact. 

 After a week note the result in the checked growth of 

 the mutilated plants. 



Vascular bundles (68). Study these as shown in the 

 stalk of Indian corn, in the leaf stems of various plants 

 and in the leaf scars on the stems of plants. 



Cambium layer (69). Locate this in sections of various 

 dicotyledonous stems, including the potato tuber; also 

 note the absence of the cambium layer in monocotyle- 

 donous stems. 



Itoot-hairs (101). Study these as illustrated when seeds 

 germinate in the seed tester. Germinated radish- seeds, 

 left in the seed tester two or three days, usually develop 

 root-hairs in great abundance. Also search out the root- 

 hairs in potted plants. Emphasize the difference be- 

 tween root- hairs and root branches. 



Effects of transplanting on root branching (105). Study 

 young plants of lettuce, tomato, cabbage etc., that have 



