CLIMBING PLANTS 



6. If the Hop is used, examine the surface of the stem to 

 see how it manages to obtain a firmer hold upon the 

 support. 



II. Take a plant (or the upper part of a plant) of the 

 Morning Glory. Examine it carefully and notice : 



1. That it is very similar to the Hop, except 



2. That it twines around its support in exactly the opposite 



direction, i.e. directly against the sun, or from left 

 to right. 



3. Make a sketch to show this. 



III. i. Watch both plants for several days, and notice 

 how they twine about the support. 



2. Try to make each twine in the opposite direction by 



twisting it about its support in the opposite way and 

 tying it. Notice : 



3. That as soon as the tip grows out beyond where it has 



been tied, it returns to its former way of twining. 



IV. Examine all the twining plants you can, and com- 

 pare them with those you have studied. 



V. Examine a plant of the common Squash and notice : 



1. The slender weak stem. 



2. The tendrils ; slender lateral prolongations which curve 



at the tips and coil about slender objects with which 

 they come into contact. 



3. That the tendrils contract spirally (i.e. shorten them- 



selves by coiling), and 



4. That, at the end next the stem, they coil in one direction, 



while at the end nearest the support, they coil in the 

 opposite direction. 



