A YEAR IN SCIENCE 91 



stalk, the filament, with the enlarged end, the anther. 

 On a mature anther note the powdery substance, the 

 lH)lh-n. Make a drawing of a stamen showing these 

 parts. 



In the center of the flower is the pistil. The large 

 bulbous base is the ovary and the three parted pro- 

 jection above is the stigma. Examine the stigma care- 

 fully. Is its upper surface smooth or rough? Make 

 a drawing of the pistil and label the parts. Make a 

 cross section of the ovary. How many compartments 

 do you find in the ovary? How many rows of seeds in 

 each compartment? Where are they attached? Draw 

 a cross section of the ovary. Make a diagram of the 

 flower showing its parts and their relation to each 

 other. Examine a number of other flowers to acquaint 

 yourself with the floral parts. 



Exercise 62. Structure of Seeds. 

 Object: To study the structure and parts of seeds. 

 Apparatus 



Scalpel Lima beans (soaked) 



Needles Castor beans (soaked) 



Dissecting microscope Corn (soaked) 



Directions : 



A. Lima Bean. 



(a) External structure. Examine a lima bean. 

 What is its color, size, shape? What are the charac- 

 teristics of the outer coating, the testa of the seed? 

 Note the scar, the Jiilum, on the concave side of the 

 seed. How was this formed? At one end of the 



