48 



PRACTICAL COURSE IN BOTANY 



one next above it has formed ? When is growth most rapid ? Reverse the 

 position of a number of scedhngs that have just begun to sprout and watch 

 what will happen. After a few days reverse again and note the effect. 



P 



63 64 



Figs. 63, 64. — Root of bean seed- 

 ling, measured to show region of 

 growth : 63, early stage of 

 tion ; 64, later stage. 



Figs. 65, 66. — Stem of bean seedling, 

 measured to show region of growth : 65, 

 early stage of growth ; 66, later stage. 



E5CPERIMENT 36. 



67 

 Figs. 67, 68. — Experiment show- 

 ing the direction of growth in stems : 

 67, young potato planted in an in- 

 verted position ; 68, the same after 

 §n ipterval of eight days. 



Can plants grow and lose weight at the same 

 TIME ? — Remove the scales from a white 

 lilj^ bulb, weigh them, and lay in a waiTn, 

 but not too damp place, away from the 

 light. After a time bulblets will form at 

 the bases of the scales. Weigh them again, 

 and if there has been any loss, account 

 for it. The experiment may be tried by 

 allowing a potato tuber or a hyacinth bulb 

 to germinate without absorbing moisture 

 enough to affect its weight. 



Experiment 37. Is the direction of 



GROWTH A MATTER OP ANY IMPORTANCE ? 



— Plant in a pot suspended as shown in 

 Fig. 67, a healthy seedling of some kind, 

 two or three inches high, so that the 

 plumule shall point downward through 

 the drain hole and the root upward into 

 the spjl. Watch the action of the stem 



