Yellow Birch and the Adirondack Forest 15 
* Graves (1) gives the number of birch on swamp land among 
trees ten inches and over in diameter at breast height as thirteen 
per acre, or 18.33 per cent of the total stand. This was an 
average of 225 acres. 
Hosmer and Bruce (2) similarly give 2.72 birch trees per 
acre, or 7.44 per cent of the total number on an average of 
ninety acres. 
Tables I and II show the composition of two typical swamp 
areas. ILardwoods were marked cull in case they had no present 
merchantable value, or, if small, had reached such a condition 
that they would never become merchantable. The reproduction 
count was made on square rod sample plots well distributed over 
the areas. 
These are given to show the composition of the swamp type 
in its relation to birch. Birch reproduction was found farther 
in from thé swamp margin than the mature trees. 
