38 



BULLETIN 275, U. S. DEPARTMENT OP AGRICULTURE. 



suppression and dominance by a figure which would allow direct com- 

 parison between trees of the same age. Height alone would be mis- 

 leading. Volume table figures can not be used, since they are based 

 on sound normal trees. The relation of height to diameter breast 

 high, expressed in total volume, was thought to be a safer index. 

 The object being to obtain directly comparable figures by ages and 

 not the exact volume, the tree was considered as a perfect cone over 

 the stump, at which we had taken the ages. From somewhat scanty, 

 but individually reliable notes, the diameters at the stump (diameter 

 outside bark 18 inches) were obtained, and from these and the height 

 the volume of the cone in cubic feet was computed. 



Table I. — Fundamental data on the pathology of the white fir. 





Age. 



Volume (cubic feet). 





No. of tree. 



For each 

 tree. 



Average 



for trees 



of same 



age. 



f rot, in- 

 cluding ad- 

 vance rot 

 (percent- 

 age of total 

 volume). 



Character of wounds. 



1 



2 



3 



4 



5 



6 



136 



60 

 69 

 71 

 72 

 72 

 73 

 76 

 78 

 80 

 81 

 82 

 84 

 84 

 84 

 85 

 86 

 86 

 86 

 87 

 87 

 87 

 87 

 90 

 92 

 92 

 94 

 96 

 96 

 96 

 96 

 101 

 102 

 103 

 103 

 104 

 104 

 104 

 105 

 105 

 105 

 105 

 105 

 106 

 106 

 107 



11.3 

 25.1 

 11.8 

 18.8 



7.7 

 18.5 

 23.0 

 12.4 

 31.4 

 45.5 

 29.9 

 44.4 



8.9 

 25.6 



7.5 

 33.7 



6.3 

 22.8 

 13.3 

 27.1 



6.8 



9.6 

 30.1 

 128.1 

 10.2 

 44.8 

 38.1 

 32.9 

 25.1 

 25.1 

 46.5 

 22.3 

 34.2 

 35.2 

 25.5 

 25.5 

 68.2 

 20.7 

 90.3 

 32.2 

 58 

 52 

 29 

 48.3 

 17.0 



15(?) 



19 



20 



20 



20 



20.3 



21 



21.3 



23 



24 



24.1 



24.6 



24.6 



24.6 



25 



26 



26 



26 



26.5 



26.5 



26.5 



26.5 



29 



30 



30 



31 



32.5 



32.5 



32.5 



32.5 



37 



38 



39 



39 



40 



40 



40 



41 



41 



41 



41 



41 



42 



42 



43 



1 [34.2] 

 12.7 



82.8 



Negligible. 



82 

 19.9 



[4.53] 



55.3 

 13.5 



16.8 . 



61 



[2. 39] 

 71.8 

 47.6 

 43.5 



46.9 



Traces. 



45.5 





105 





145 





135 



Very slight lightning. 



147 



143 



Fire; healed. 



159 



Lightning. 



Ill 



Very little lightning. 

 Do. 



134 



139 



Several scars. 



138 



Lightning (?). 



89 



No wounds. 



125 



Fire, orjen; lightning. 

 Little lightning. 

 No wounds. 



130 



133 



137 



Little lightning. 



144 



146 



No wounds. 



148 



Ligthning. 



149 



Very little lightning. 

 Lightning with fire. 



124 



129 





88 



Fire, healed; lightning. 



90 



128 



Very little lightning. 



103 



Fire, open; lightning. 

 Fire, open. 



122 



127 



76-a 2 



Fire, open. 



Lightning. 



Do. 



76-b 2 



21 



120 



Fire, open. 

 Fire; lightning. 



132 



46 





72-a 



Lightning. 

 Do. 



72-b , 



158 



Old girdling; lightning. 

 Fire, open. 



126 



18 



20 



Do. 



45 



Do. 



87 



Do. 



102 



Fire, open. 



121 



68 



Falling tree. 



1 The use of brackets ([]) in column 5 indicates superficial decay of sapwood. 



2 The letters a and b indicate two distinct foci of decay in the same tree. 



