278 THE BIOLOGY OF THE PLANT 



nodal cells the same in position and number on 

 all the leaves? What is the shape of the end 

 ceU of the leaf ? Notice the leaflets. On what 

 part of the leaf do you find them ? Do they dif- 

 fer in any important details from the leaves? 

 Are the leaflets arranged in whorls ? Are all the 

 leaflets at one node equally well developed ? Do 

 you find any relation existing between the leaves 

 and the point of origin of the branches ? 



Put on the high power and examine the ceUs 

 of the same leaf. Do you find that they have 

 the usual cell contents? Note the chlorophyll 

 grains. What is their shape? Size? Position 

 in the cell ? Do you find any part of the ceU- 

 wall which is not covered by the chlorophyU 

 bodies? Are the chlorophyll bodies in contact 

 with one another ? Do you find any of them di- 

 viding? Are they stationary or do they move? 

 What plant have you examined whose chloro- 

 phyU bodies most closely resemble these ? Notice 

 the thickness of the cell-wall. Notice the proto- 

 plasm moving in the end cefls of the leaf. (This 

 topic will be studied later under " Physiology.") 

 Make drawings of the structures of the leaf. 



c. The reproductive organs. 



1. The antheridia. — Select two or three leaves 

 upon which may be seen, with or without a hand- 

 lens, small, orange-colored bodies, the mature an- 

 theridia. On which leaves are the antheridia 

 borne in the largest numbers? Examine with a 

 low power. On what part of the leaf do you find 

 them ? What is their relation to the nodes ? To 

 the leaflets ? Are the antheridia situated with 



