322 FORESTRY IN NEW ENGLAND 



what could be secured in a stand repeatedly thinned, for ex- 

 ample, thinned in the twenty-fifth year and then at intervals of 

 ten years, but the total amount obtained from repeated thin- 

 nings, say at the ages of twenty-five, thirty-five, forty-five, and 

 fifty-five years, would exceed that secured by a single thinning 

 at fifty-five years. If the age at which the last thinning is to 



By permission oj the U. S. Forest Service. 



Fig. ii8. — A cutting which removed about 50 per cent of the stand, and should result 

 in securing reproduction. See Fig. 117. 



be made is known, the yield given for a thinning at that age 

 may be accepted as a very conservative estimate of what can be 

 secured from a stand by the thinnings during the rotation. 



The yield from thinnings, as explained in Chapter V, is se- 

 cured without decreasing the final yield of the stand. The 

 thinnings in the latter half of the rotation often result in the 

 bringing in of pine reproduction and sometimes may result in 

 fully stocking the ground. In such a case the entire stand 



