12 STUDY OF COMMON PLANTS. 



Draw and describe the various parts of some of the 

 different seeds. 



II. Compare in the same way peas, beans, lima bean, 

 lupine, and peanut. Are they essentially alike in struct- 

 ure ? Mention points of difference. 



III. Compare seeds of squash, pumpkin, watermelon, 

 muskmelon, cucumber, and gourd. 



IV. Compare seeds of tomato, egg plant, pepper, stra- 

 monium, and hyoscyamus. 



V. Compare the seed-like fruits of sunflower, dandelion, 

 thistle, lettuce, and salsify. 



In all the groups thus studied ascertain whether the 

 seeds are more alike than different. Sections should be 

 made and drawings introduced wherever they are needed 

 to render the descriptions more intelligible. Some of the 

 groups may be omitted if necessary, but the observations 

 should be thorough and complete as far as they are 

 carried. 



SPECIAL STUDIES. 1 



I. Polyembryony in the genus Citrus. This requires 



an extended comparison of seeds of different 



varieties of orange, lemon, and other citrus fruits. 



II. Arillate seeds. A study of the seeds of Celastrus 



scandens and other arillate species. 



III. Relation of the embryo to the reserve material. 

 Arrangements that favor a prompt supply of food 



1 A few subjects for special study are given in connection with this 

 and other exercises simply as examples of many that will naturally 

 suggest themselves. In most cases the studies suggested require inde- 

 pendent investigation, while others, such for example as number IV, give 

 opportunity for reading and reporting on papers of special interest, par- 

 ticularly those in recent periodical literature. 



