^O so ^O 70 S'O fO /crp //(P 



Fig. 4. Sprnce; Middle and- North Germany; Sites I-V; Normal Yield of 

 Mam Stand in cubic ft. per acre. Also the points indicating at what age the average 

 ■tree attains a diameter of 8", 10" and 13", and a height of 40 ft., 50 ft., etc. Only 

 wood 3" and over is here considered. 



153 



