Figure 4. 

 Oyster-shell bark-louse,- 

 See page 69. 



-just hatched. 



Figure 5. 

 Oyster-shell bark-louse,- 

 See page 69. 



-mature form. 



Figure 6. 



Bridge-grafting of a girdled tree. 



See page 76. 



Figure 7. 



Saved by bridge-grafting. 



See page 76. 



