168 



LJSSSOirS WITS PLANTS 



Is the dust which irritates the eyes of the workman when the com 

 is in full tassel ? Is there one silk, and only one, to each ker- 

 nel ? Are there always a definite number of rows of kernels on 

 each cob ? Are the rows in even or odd numbers ? Do different ears 

 on the same stalk always have the same number of rows ? Having 

 found the staminate flowers, determine if the plant is dichogamous. 



x;kxi. diclinous flowers, concluded 



189. A calla is shown 

 in Fig, 168. At first 



glance, it appears like 

 a flower with a single 

 great petal and one 

 pistil ; but we have not 

 thus far discovered flow- 

 ers of one petal, and 

 the form of the part 

 makes us suspicious 

 that the structure must 

 have some special in- 

 terpretation. We have 

 already found that the 

 proper way in which to 

 understand a flower is 

 to begin at the inside. 



190. Tearing away the 

 wax -white part, we have 



