INCENSE CEDAR. 



23 



suppression the seedling stage is followed by a period of more or 

 less rapid height growth. 



Incense cedar, under ordinary conditions, makes its fastest height 

 growth between the ages of 40 and 150 years, growing most rapidly 

 between the fiftieth and seventy-fifth years. When the maximum has 

 once been reached, however, height growth falls off rapidly until at 

 about 100 years the periodic or current annual growth falls below 

 the mean annual growth. Beyond 150 years, growth in height is 

 merely nominal. While height growth varies in amount in different 

 localities, the above statements held true in every case studied, except 

 one on the Plumas National Forest. Here, while the rate of height 

 growth at no time equaled the maximum in other localities, the period 

 of height growth was prolonged considerably, continuing at a fair 

 rate up to 300 years of age. 



Table 13. — Height groicth of incense cedar. 



[curved.] 



Locality. 



Eldorado. 



Plumas. 



T. 24 N., 



B.5E. 



T. 24 N. 

 R. 10 E. 



Stanis- 

 laus. 



Average 



of all 

 above the 



mean. 



Average 



of all 

 below the 



mean. 



Mean. 



Total 

 height. 



Basis 

 number 

 of meas- 

 urements. 



Total height (feet). 



Years. 



60.. 

 80.. 

 100. 



120. 

 140. 

 160. 

 180. 

 200. 



220. 

 240. 

 260. 

 280. 

 300. 



320. 

 340. 

 360. 

 380. 

 400. 



52 

 67 



78 



86 

 92 

 97 

 100 

 104 



106 

 109 

 112 

 114 

 116 



118 

 120 



Basis number of 

 measurements 



60 



63 

 74 

 83 

 90 

 96 



101 

 106 

 109.5 

 113 



116 



119 

 121 

 123 

 125 

 126 



91 

 93 

 95 



96.5 



99 

 100 

 101 

 102 

 103 



319 



95 

 100 

 104 

 108 



112 

 116 

 119 

 122 

 124 



127 

 129 



34 



58 

 73 



84 



92 



98 

 102 

 105 

 108 



111 



113.5 



116 



118 



119.5 



121 



122.5 



124 



125.5 



127 



12 



29 

 43 



53 

 60 



67 

 71 



76 



79 

 82 

 85 

 88 



89.5 



91 



92.5 



94 



95.5 



97 



Feet.i 

 23 

 49 

 65 



75 

 82 

 86 

 90 

 93 



96 

 98 

 101 

 103 

 105 



106 

 108 

 109 

 110 

 111 



46 



177 



196 



96 



2 515 



1 Figures rounded off to the nearest foot. 



2 The difference between this figure and the total number of measurements indicated for the different 

 localities is due to the inclusion of additional measurements, more or less scattered, from other localities 

 in deriving the mean. 



DIAMETER GROWTH. 



Rapid diameter growth is confined largely to early life, although 

 under favorable circumstances it continues for a considerably longer 

 period than rapid height growth. Under ordinary conditions it 



