A METHOD OF YIELD REGULATION 



MfiTHODE DU CONTROLS ' 



By M. Muret 



Translated and Briefed by K. O. Ward 



The method intended for selection forest was originated in 

 France by M. Gurnaud. It has been tried successfully in France 

 and in Switzerland, especially in the canton of Neuchatel. In 

 this canton, M. Boilley used it on private and communal forests. 



It consists in making successive reconnaissances of the whole 

 forest, going over the whole area at short intervals of six to ten 

 years. The reconnaissances are all made under absolutely like 

 conditions. 



The amount of increment is obtained by deducting the volume 

 found at the last reconnaissance from that of the preceding. A 

 stand table is made. The stand is divided roughly into three main 

 age classes — small trees, medium, and large ; corresponding to our 

 reproduction and immature, young merchantable, and merchan- 

 table. The first class includes all trees below .30 meter in diam- 

 eter (about 12 inches), the second, between .30 and .50 meter 

 (approximately 12 to 20 inches), the third, over .50 meter (over 

 20 inches). 



The cut is taken in per cent, of the material on the area ; based 

 on the vigor of growth at dififerent ages (ascertained by recon- 

 naissance). The diameters are measured by a tape and the tree 

 is stenciled with a horizontal arrow where the tape rested. Meas- 

 urement is made at breast height. 



The method seeks the proportion of trees in the different classes 

 at each reconnaissance rather than the exact measurement of the 

 timber. 



'A search through the foreign periodical hterature for material bear- 

 ing on forest organization, brought to light the articles by M. Muret on 

 the "Methode du Controle," in the Schweizerische Zeitschrift fiir Forst- 

 wesen (Journal suisse d'Economie forestiere), vol. 48, April, May, 

 November, 1897, pp. 148-152, 187-190, 407-410. The above brief thereof 

 has been prepared by Mr. K. O. Ward, a student in the Department of 

 Forestry at Cornell University, who translated the articles from the 

 French. 



None of this material has heretofore appeared in American literature 

 or in any textbooks, either here or abroad, as far as is known. — A. B. R. 



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