O E TTING J4S TA B LI SHED 



79 



By means of this apparatus any part of the plant, 

 even if bent or crooked, may be instantly marked 

 and with much greater accuracy than if 

 done in the usual way. In place of a 

 spool we may use two small notched 

 wheels (obtainable of watchmakers) 

 soldered together on a small piece of 

 wire. 



What protects the delicate tip of the 

 stem as it is driven forcibly through the 

 soil ? Compare the devices by which 

 the Corn (Fig. 56) and Scarlet Runner 

 (Fig. 57) protect the tip. What hap- 

 pens if the tip is injured ? Remove it 

 and see (compare Fig. 65). Do new 

 branches arise! When? Where? In 



lv u n n e r \TrTi Q "i~ tfiivor* 

 Bean with top (ter- 

 minal bud) removed. tlOn do they 



grow ? Is this the direc- 

 tion which branches nor- 

 mally take f What advan- 

 tage in this direction of 

 growth ? 



What happens if a stem 

 meets an obstacle which it 

 cannot push aside? Plant 



SOme Seeds tWO Or three 66. Radish seedlings growing upward 

 , , ii. along the glass side of a box toward 



inches deep against tlie obstacles placed in their path. 



