PERIODICAL literature: 301 



meet obligations without premature cutting of timber ; testing and pro- 

 viding machinery, tools, fertilizers, seed and plants ; uniformity of 

 conditions of forest employment ; education and information of mem- 

 bers in up-to-date scientific and technical matters. The State, by proper 

 supervision of the associations, could keep their activities in the right 

 channels and guard against the development of a trust injurious to the 

 public interest. ' W. N. S. 



Hoffman. 1st die Vergesellschaftung im Forstbetriehc w,dglich? Forstvviss. 

 Centralbl. 41:310-226. 1919. ' 



1919. 



MISCELLANEOUS 



Forest engineers have been too given to the 

 Improvement use of straight lines in laying out forest roads, 

 of with the result that the latter can not always be 



Forest Roads used satisfactorily for the transportation of 

 forest products. This difficulty should be avoided 

 by using curves to carry roads around obstacles such as lakes, cliffs, and 

 ravines. Methods are given in some detail for laying out reverse curves 

 and for constructing directly the arc of a circle by means of an in- 

 scribed regular polygon. S. T. D. 



P. F. Amelioration des chemins forestiers. Revue des Eaux et Forets. 57:69- 

 74. 1919. 



