PEPPER AND EGG-PLANTS 239 



21. Weed Seeds. — How many kinds of weed seeds did you 

 find in the sample used in exercise for purity of clover 'i Do 

 you know all the kinds ? 



Heat a quantity of soil long enough to kill all seeds in it. 

 If you are in doubt, keep the soil wet, and in a warm place 

 for a week. If any growth appears, heat it a second time. 

 Plant your weed seeds in this soil and see if you can recognize 

 the little plants. 



22. Grasses. — Repeat the preceding exercise for grasses. 



23. Potato or Tomato. — Describe the plant. Make a 

 drawing of the leaf. How are the leaves arranged on the stem ? 

 Where are the flowers located ? Are they single or in groups ? 



Make drawing or diagram showing location of fiowers and 

 character of infiorescence. Dissect a flower and make draw- 

 ings of parts. 



How many sepals ? How many petals ? How many sta- 

 mens ? How many pistils ? Is it gamo- or poly-sepalous ? Is 

 it gamo- or poly-petalous ? 



24. Tomato Fruit. — Examine a few good tomato fruits. 

 Can you find the calyx ? 



Can you find the corolla ? 



From what part of the flower is the fruit developed ? 

 Do potatoes form the corresponding part of the flowei*? 

 Why? 



How many seeds in a single tomato ? 



25. Potato Tuber. — Examine a potato tuber. Is the tuber 

 a root or a stem ? 



What are the eyes of the potato tuber ? 



Cut a potato tuber so that some of the pieces will have eyes 

 and others not. Plant and watch for germination. Will they 

 all grow ? From what part of the piece do the sprouts arise ? 



26. Pepper and egg-plants may be studied in the same man- 

 ner as indicated in the exercise with tomato fruit. 



