154 STUDY OF COMiMON PLANTS. 



ment with those of the juniper? Are the leaves 

 of the red cedar all alike? Do they all exhibit 

 the same arrangement? 



2. If the fruits are to be had, study their structure and 



points of resemblance and difference. 



3. If living specimens are accessible, compare the habits 



of the two species. Which assumes the size and 



habits of a tree ? Is this difference constant ? 



II. Next compare these with the conifers previously 



studied. What characters are common to the juniper 



and red cedar that do not belong to the pine, spruce, 



and hemlock ? 



ARBOR VIT^. 



I. Observe the form of the leaves and their arrange- 

 ment on the branches. Are the leaves all alike ? Do 

 they exhibit any structural peculiarity not observed in 

 those of the other conifers ? 



II. Compare the cones with those of other genera. Is 

 the arrangement of the scales the same? How does it 

 compare with the leaf arrangement ? 



When the pollen of the different species begins .to be 

 shed in May, compare the structure of the flowers, both 

 staminate and pistillate, of as many different conifers as 

 can be obtained. 



I. How do the staminate flowers of the hemlock differ 

 from those of the Norway spruce? From those of the 

 pines? What peculiarities are presented by those of the 

 red cedar? 



II. Make a similar comparison of the pistillate flowers ? 



HI. Of all the species studied which are monoecious? 

 Are any of them dioecious ? 



