EXPKRIMKNTK IN CROSS-FKRT1U/AT1OX. 1 ">7 



of the following: Sugar-cane, Guinea grass, 

 sour grass, niai/c. 



4. Examine the 4 flower' of tlie sunflower. 

 The yellow structures around the edge are 

 very different to the central portion, and at 

 first suggest petals. Where then are the sta- 

 mens, and the pistil ? Cut the head through : 

 the middle is seen to be made up of a number 

 of separate tubular bodies, each of which 

 possesses its own petals, stamens and pistil. 

 The head is not a single flower but a rollnthH. 

 offlouvnt. This is true of all the plants in the 

 large order to which the sunflower belongs. 



KXI'KRIMRNTS IN CROSS- FERTILIZATION. 



1. On a squash, pumpkin or melon plant 

 examine the separate pistillate and staminate 

 flowers, and learn how to distinguish them be- 

 fore the flower-buds are open. Watch them 

 and notice that the fruits, (squashes, pump- 

 kins or melons, as the case may be ) are only 

 formed from pistillate flowers. Staminate 

 flowers after shedding their pollen die. 



Tie up two pistillate flower-buds 

 (which are almost ready to open) in separate 

 bags made of thin, tough paper. When one 

 of these flowers is open, pluck a staminate 

 flower and remove its petals ; uncover the 



