LABORATORY MANUAL 39 



DIRECTIONS FOR WORK: Number all drawings and the 

 description or answer called for, to correspond with direc- 

 tions. 



(1) Lay a dry bean on your paper and draw its outline as 

 seen from the broad side. Compare length and width. 



(2) Compare the thickness of the bean with the width. 



(3) Describe the color. Is it uniform? 



(4) Find a rough, light spot on the bean and describe its 

 location. 



(5) What does this tell of the previous history of the seed? 

 (Look at the beans in the pod, if necessary.) 



(6) Examine a soaked bean and compare it with a dry 

 bean as to size and color. Can you find the light spot? 



(7) Make a lengthwise scratch with a pin in the coat of 

 the soaked bean on the side farthest removed from the light 

 spot. Deepen the scratch until the coat is cut through and 

 then remove the coat. The contents of the coat is termed 

 the embryo. How many large parts or organs are readily 

 distinguishable? 



(8) How are these large organs or seed leaves held to- 

 gether? 



(9) Carefully break off one of the seed leaves. Do you 

 find something between them? This is a leaf bud; describe 

 the number of parts, their shape, and their attachment to 

 another organ of the embryo. 



(10) Draw separately each of the 'organs of the embryo. 

 Number the pointed body (the root) 1; the seed leaves 

 2 and 3; their connection with the stem 4; the leaf 

 bud 5. 



(11) Using a pin, try to spread out the tiny organs which 

 you found in Case 9. What is their shape? 



(12) Examine and make a drawing of a soaked bean seed 

 which has been lying on moist blotting paper or in damp 

 moss for a few days. Number the parts shown in the draw- 

 ing to correspond with the parts of the embryo. 



