APPENDIX II 159 



THE hints contained in the introductory paragraph should 

 be emphasized by the teacher and illustrations suggested or 

 called forth from the class. The struggle for light and air 

 thus illustrated will not be easily impressed upon their 

 minds in any other way. It is important that these points 

 should be made plain in order that the student may under- 

 stand why it is that plants take to climbing. 



I. Manettia is a common plant with the florist. Small 

 ones, trained about slender stakes, may often be obtained in 

 pots, and in this condition are readily available for observa- 

 tion in the laboratory. 



II. Any species of Ipomxa will do. Several species are 

 grown in the greenhouses. 7. purpurea, the common Morn- 

 ing Glory, may be readily raised from seed in pots and 

 allowed to twine about slender stakes. 



IV. Especially Beans, Cypress Vines, Dutchman's Pipes, 

 Yams, etc. 



V. The Grapevine also has excellent tendrils, but their 

 homology with branches is not easily made out. Ampelop- 

 sis sp., i.e. the Virginia Creeper and the Japanese Creeper, 

 have tendrils which form suckers at the ends and attach 

 themselves to flat surfaces in this way. 



VI. Peas can be raised very easily in boxes in the labo- 

 ratory. Five to six weeks will generally be sufficient for 

 their growth. 



VIII. Solatium jasminoides may often be obtained from 

 florists, during the winter, in small pots and will climb about 

 slender supports. 



Compare Gray, Text-book, p. 117, Fig. 235. 



IX. Pressed specimens often show the habit very well. 



