72 THE WOODLOT. 



FIGURE 22. 

 Diagram of Staxd ix Middlesex County, Mass, 



This diagram shows the varied and largely inferior growth of Pitch Pine, White 

 Pine, and Gray Birch which gradually fills up old pastures. Occasional judicious 

 improvement cutting will do much to help along the valuable species which would 

 otherwise often be suppressed or kept out altogether by the worthless kinds. Pitch 

 Pine 2, in this example, is already injuring White Pines 1 and 4, and if left where it 

 ■is TN-ill suppress White Pines 2 and 3. To a less degree Gray Birches 1, 2, and 3 are 

 working the same sort of harm, and they are such profuse seeders that, if allowed to 

 stand, they will only cover still more ground. With these injurious trees taken out, 

 enough will remain to form a forest cover in a short time. 



