CHAPTER IV. 



COMMON FLOWERS TO COMPARE WITH THE FLOWER OF 

 THE ORANGE. 



1. Common plants are examined, in order to illustrate the more im- 



portant modifications which they severally present, due, chiefly, to 

 varying conditions of cohesion, adhesion, and suppression of parts. 



2. Opium Poppy. 



3. Indian Mustard. 



4. Rose. 



5. Melastoma, 



6. Garden Zinnia. 



7. Rose Periwinkle. 



8. Basil. 



9. Grass-cloth Nettle. 



10. Willow. 



1 1. Points of agreement in the structure of the plants just examined. 



12. These characters are strengthened by other characters derived from 



the seeds and wood. 



13. Germination, and the way in which it takes place in the Pea. 



14. Comparison of the seeds of Pea and Castor-oil Plant. Albuminous 



and exalbuminous seeds. 



15. They are both dicotyledonous. 



16. No characters are absolute. 



I. Gather flowers of as many of the following common 

 plants as you are able. The accompanying woodcuts must 

 do duty for those which are not in flower, or which happen 

 to be out of reach : — 



