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? 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 flowers and 

 character of inflorescence. 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 flower? 

 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. 



