116 COLLEGE BOTANY 



(/) Government Work. — Our national government has ex- 

 plorers traveling in different parts of the world in search of 

 economic plants vs^hich can be introduced and grown in this 

 country with profit. This work has resulted in the introduction 

 of several new and valuable crops, of which alfalfa, now grown 

 so extensively throughout the greater part of the United States, 

 is an excellent illustration. 



LABORATORY EXERCISES. 



Exercise 1. Examine an open flower of peach. Note superior ovary and 

 relation of the other parts of the flower to it. From what is the fruit 

 developed? (Preserved material is satisfactory for study.) 



Exercise 2. Examine an open flower of apple. Note the inferior ovary 

 and relation of the other parts of the flower to it. From what is the fruit 

 developed? (Preserved material is satisfactory.) 



Exercise 3. Examine fruit of the peach and note the exocarp, meso- 

 carp and endocarp. (Preserved material is satisfactory. Small fruits are 

 satisfactory and require less room.) 



Exercise 4- Examine the apple and note the calyx at blossom end, and 

 the core or papery endocarp. (Preserved material is satisfactory.) 



Exercise 5. Examine blossoms and fruit of blackberries and raspberries 

 if convenient. Note aggregate ovaries. 



Exercise 6. Examine strawberries. Note fleshy receptacle and 

 the achenes. 



Exercise 7. Examine gooseberry, orange or other berry fruit and note 

 all their parts. Prom what are they derived? 



Exercise 8. Examine a bean or pea pod. Note that it is a simple ovary. 

 Also note the point of attachment of the seeds. 



Exercise .9. Examine a number of both fleshy and dry fruits to de- 

 termine number of carpels and character of placentae. 



Exercise 10. Examine seeds illustrating methods of sieed dispersal. 

 Dicotyledonous. 



