30 



PRELIMINARY STUDIES. 



dant ? Represent by drawings as many different types of 

 stomata as you find. Each figure should show a number 

 of the superficial cells of the epidermis and the position of 

 the stomata with reference to these cells. 



6. Study the 'flowers of the Indian Corn. The male 

 flowers are borne in spikes at the very top of the plant. 

 They constitute the tassel. The female flowers are borne 

 lower down. Each filament of silk is the style of a flower. 

 When pollen grains are brought in contact with the stig- 

 mas at the ends of these styles, they send minute tubes 

 the entire lengths of the filaments into the ovules at their 

 bases. The fertilized ovules mature into the seeds 

 kernels of Corn. The fruit is the entire ear of Corn with 

 the husks. 



Is Corn anemophilous or entomophilous? Are its flowers 



perfect? Complete? Is the plant monoecious or dioecious? 



1. Study the flower of any Lily that is available. The 



Trillium, Wild Orange-Red Lily, and the Tiger Lily 



are good. Is the flower 

 perfect ? Is it complete ? 

 Is it regular, i.e., are 

 all the organs in each 

 set of parts of the same 

 shape and size ? Is it 

 symmetrical, i.e., are the 

 numbers of each set of 

 organs the same ? Draw 

 as many of the follow- 

 ing parts as you find : 

 a sepal, petal, a pistil 

 showing ovary, style, and 

 stigma, a stamen show- 

 ing filament, anther, and dehiscence of anther. Show by a 

 figure a cross section and a longitudinal section of the 

 ovary. (See Fig. 10.) Is the flower you are studying 



FIG. 10. Transverse section of ovary 

 of Orange-Red Lily. (X 35.) 



