42 



REPRESENTATIVE PLANTS 



are annual? Examine shepherd's purse and peppergrass 

 very early in spring. When did these rosettes of annuals 

 start to grow? 



Examine plants growing in sandy and very dry places, 

 and find, if possible, any leaf peculiarities. Do you find 

 any number with common features? If so, try to find 

 some explanation. 



Examine plants found in dark woods, and compare with 

 the same kind of plants in similar soils growing in bright 

 sunshine. 



Study carefully as many water plants as you can obtain, 

 and seek for characters shared in common by all. Examine, 

 if possible, leaves from all sources, under the compound 

 microscope, for any peculiarities of stomates or structure. 



Conclusions. From all the examples you have studied, 

 what do you conclude regarding the influence of surround- 

 ings on leaf structure? 



Table. Tabulate your observations on the forms examined, 

 using the following (Two examples are given as guides to 

 proper use.) : 



9. Useful Products of Leaves axd Application op 

 THE Study to the Wants of Man 



1. Make a table of useful leaves and their products, using 

 the following form, seeking particularly to have important 



