Bui. 39, Biological Survey, U. S. Dept. of Agriculture. 
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Plate IX. 
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Work of Sapsucker on Hickory, Maple, Basswood. and Chestnut; Bird's-eye. 
[1. The beginnings of a girdle on mocker nut. 2, Well-developed girdles, tree 2 feet in diameter. 
3. Mocker nut. killed by sapsuckers. 4. Sapsucker pecks and stains in sugar maple wood. 
6. Natural birds-eye in sugar maple. 6. Sapsucker bird's-eye in same wood. 7, Stains due to 
sapsucker pecking* in basswood. 8, Stained knotty checks in chestnut.] 
