15 



following subjects: (1) The needs of the tract and the objects to be gained 

 from the marking; (2) an outline of the manner in which the different types 

 should be marked in order to accomplish these results; (3) special regulations 

 regarding the disposal of brush, protection of the remaining stand, place of 

 scaling, and any other points that should be included in the contract. The 

 Supervisor should approve these recommendations with any additions or modi- 

 fications that he considers advisable and submit it with the formal application 

 for the Forester's approval. 



Variation of Diameter Limit in Timber Sales 



Forest officers should inform applicants and purchasers of timber from the 

 National Forests that the Forest Service does not guarantee that the estimated 

 amount of timber can be cut from the area covered by the application or con- 

 tract, and also, if diameter limits are specified in the application or contract, 

 that the diameter limits are approximate and will be varied wherever necessary 

 in the judgment of the Forest officers. Before the execution of any contract, 

 prospective purchasers should be shown, whenever possible, exactly how the 

 timber will be marked. Forest officers should explain that it may be necessary 

 slightly to modify the method of marking if the conditions after the cutting 

 actually begins seem to demand it. 



Transactions to be closed 



In order to insure the prompt closing of all free use, timber sale, timber tres- 

 pass, and other transactions upon the National Forests, officers in charge will 

 please adopt the following system of reminders : 



The date of the expiration of all permits and contracts covering a period of 

 not more than one year should be entered on a desk calendar. For instance, a 

 free-use permit dated August 1, 1907, to cover a period of three months, should 

 be entered under date of November 1. This does not apply to the larger trans- 

 actions which cover long periods of time. 



OFFICE OF SILVICS. 



New Forest Literature Compiled by the Librarian. 



The publications announced in this list consist of those on file in the Service 

 library. 



Forest Botany 



east 

 Elisha Mitchell scientific society, 18th year, pt. 1, 190 



New east American thorns ; W. W. Ashe. 1902. 12 p. From Journal of 



, pt. 1, 1902. 

 New North American thorns ; W. W. Ashe. 1903. 22 p. From Journal of 



Elisha Mitchell scientific society, 19th year, pt. 1, 1903. 

 Some new Pennsylvania thorns ; W. W. Ashe. 1902. 12 p. From Annals of 



the Carnegie museum, vol. 1, pt. 3, May, 1902. 

 Silvics 



Some fundamental principles of silviculture ; H. Mayr. 1907. 16 p. From 

 Forestry quarterly, vol. 5, 1907. 



Educational 



Classified list of publications available for distribution July 20, 1907; Forest 

 service. 4 p. 



Forest Management 

 Volume and Yield 



Form und Inhalt der Weissfohre (Form and volume of the pine) ; A. Schiffel. 

 1907. 89 p. W. Frick, Wien. 



Uber die Kubierung und Sortierung stehender Nadelholzschafte (On determin- 

 ing the cubic contents and grades of standing coniferous timber) ; A. 

 Schiffel. 1906. 13 p. From Centralblatt fur das gesamte forstwesen, 

 no. 12, 1906. 



Zuwachsautograph (Instrument for measuring the increment of trees) ; J. 

 Friedrich. 1905. 7 p. Illus. From Centralblatt fur das gesamte forst- 

 wesen, no. 11, 1905. 



