i6o 



near the point or tip. This is said to be a resin gland. This 

 gland can be seen more plainly on the surface leaves that are 

 two years old. 



Most of the leaves persist for at least two and sometimes 

 three years ; but even older ones can be found. These older 

 leaves, however, do not exist as green active leaves, but merely as 

 dried up and lifeless scales. These lifeless leaves, are probably 

 detached from the branches by the forces of nature. 



The Arbor-vitae. Nearly full size. 



The cones are even smaller than the hemlock cones. They are 

 borne in the axils of the leaves in the same manner as the branch- 

 lets and are not conspicuous unless one is close to the tree. 



The arbor- vitae is much planted for hedges and screens, as well 

 as for other ornamental purposes. There are many horticultural 

 varieties. The tree is abundant in a wild state in New York. 



