514 Forestry Quarterly 



his system everywhere, Wessely points out that the conditions 

 favorable to natural regeneration under Wagner's method are also 

 favorable to artificial reproduction. The question as to whether 

 regeneration or reforestation are applicable depends on condi- 

 tions of precipitation. Where in this respect optimum conditions 

 exist, there is no need of preparing favorable conditions and regen- 

 eration comes readily and special measures of management are 

 uncalled for. Where conditions of precipitation are entirely 

 unsatisfactory, Wagner's method might be, but to only a small 

 degree, an improvement, and only if it is not objectionable from 

 economic points of view. The strip selection system, then, belongs 

 into localities of mediimi precipitation and where weather condi- 

 tions generally are such as to require an increase of safety. Here, 

 where there is still to be foimd tendency to natural seeding, the 

 beginning of cutting on the north side in strips favors the yovmg 

 growth by protecting it against sun, wind and frost. 



An objection which is raised because of the age-class arrangement 

 under the old system which is based upon the progress of the 

 fellings from east to west, and which under the change would 

 require cutting tmripe stands, is met by various propositions 

 to overcome this. Incidentally, it is shown that the determination 

 of financial ripeness of the same stand by various methods may 

 differ by 30 years. 



Pas Blender sautnschlag-sy stem und seine Bekampfung. Centralblatt fur das 

 gesammte Forstwesen, May-June, 1915, pp. 179-88. 



An extensive study by Forstassessor Nach- 

 Height Growth tigall concerns itself with the progress of and 

 of influences on height growth in young spruce 



Young Spruce stands in one season. 



The author refers to the great variation in 

 form of spruce, citing a number of such variations, the cause of 

 which has so far escaped discovery. There are at least seven 

 classes of influences to be recognized: 1. Food materials of soil; 



2. Carbonic acid of air, electric, magnetic forces and gravity; 



3. Other conditions of air and soil (some seven are enimierated) ; 



4. Age and individual tendencies, heritage; 5. Competition with 

 neighbors; 6. Natural enemies, including frost, drouth, winds; 

 7. Influences of man. 



