THE WESTERN YELLOW PINE MISTLETOE. 15. 
TABLE 9.—Comparison of the average height growth or accretion of 102 felled western 
yellow pine trees, for a 25-year period, grouped by age classes and degree of mistletoe 
infection. 
Accre- Accfe- Accre- Accre- Accre- 
De- Total tion tion tion tion |' tion 
gree | height. | 1390- | Total | 1895- | Total | 1900- | Total | 1905- | Total|1910-|_ 
Age of 1995, |height,| 1900, /height,| 1905, /height,| 1910, jheight,| 1915, |Basis. 
class. infec peri- | 1900. | peri- | 1905. | peri- | 1910. | peri | 1915. | peri 
tion. odic odic ic odic odic 
1890 | 1895 jannual annual annual annual annual 
Years Feet.| Feet.| Feet..| Feet. | Feet. | Feet. | Feet. | Feet. | Feet. | Feet. | Feet. | Trees 
2i to 60.-...- ry) 3.2] 5.4] 0.44 8.0} 0.52] 11.3] 0.66] 149] 0.72] 18.6] 0.74 11 
x 2.6| 5.1 50 8.3 bet tT T22 .78| 15.3 -62 | 18.2 .58 6 
ax). 6:1. 3.2 32 4.6 28 6.1 30 7.4 25 8.6 24 7 
xxx 42.37 2.5 24 3.8 26 4,9 3.5, 5.7 16 6.3 .12 5 
61 to100....| o | 27.4 | 31.5 .82| 35.6 .82} 39.5 .78 |. 43.2 .74| 46.6 .68 12 
x | 29.6 | 32.2 .52| 346 -48 | 36.8 44] 38.8 .40| 40.8 40 7 
xx | 23.7} 26.1 43: 1.983 .44] 30.5 .44|. 32.1 .32| 33.3 24 9 
xxx | 23.4 | 284 40 P Sey sae 4 Sb 2 ~24 | 32.2 .20| 33.0 16 17 
101 to 140...| o | 58.9 | 61.5 .52| 64.2] .54| 66.9 54] 69.7 .56 | 72.5 56 6 
x | 49.4| 51.8 481 53.5| .34] 55.0 3 56.4 | .28| 57.5 22 4 
xx | 55.8 | 57.9 -42| 60.0| .42] 61.9 38 63.5 | 32 | 65. 0 30 4 
xxx | 46.4/47.8| .28| 49.0| .24] 50.0] .20| 506! .12}] 51.2! .12 4 
201 to 240...| o | 75.5 | 76.7 3£ 17s B LooF., 98.9 222 b-- 80:0 .22| 81.2 24 5 
xxx | 71.4 | 72.0 <9 P75 .10 | 73.0 10] 73.5 .10| 74.0 -10 | 5 
Taste 10.—Comparison of the average volume growth or increment of 102 felled western 
yellow pine trees, for a 25-year period, grouped by age classes and degree of mistletoe 
infection. 
Increment, Total Tncrement, Total 
gree Total volume. 1890-1895. volume. 1895-1900. volume. 
Age class, rie eee 
pe |. 1990 1895. | Periodic annual. | 1900. | Periodic annual. | 1905. 
Cubic Cubic Cubic Pe Cubic Cubic Per Cubic 
Years feet. feet. feet. cent. feet. feet. cent. fect. 
og hess Se 2 | ae (9) 0.36 0.54 0.036 (@) 0.80 0.052 (1) 1.19 
24 .02 .05 2006 | 22cueee es . 20 = O50 3s ere aoe -Al 
xx .O1 .02 OD te RG ee .08 SO12me Spe .14 
5 38) DELS. Dy SEB We ee eee oe | Pee eae . 04 SOS py See .08 
61 1900. 2.53 (9) 3.77 _ 5.40 .326 8.6 7.54 -428 7.9 10. 23 
x 4.90 —~8.91 . 202 4.1 } 7.10 . 238 4.0 8.49 
= 8.4 2.53 3.24 - 142 5.6 3.98 -148 4.6 4.81 
xxx 4.12 4,94 . 164 4,0 5. te . 156 21 6.46 
10] to 140. ..... ) 35. 10 39.78 | - 936 2.7 44. 30 1.004 | 2.5 50. 26 
= 25.95 30.15 . 840 Sep. 34. 80 .930 | 2s 39.20 
55.8 23.72 26.35 .526 2, 28.62 454 £7 30.75 
xxx| 20.02] 21.04 204 1.0| 22.87 "366 | 1.7 24.10 
202 to 240...... (9) 59.06 63.94 .976 Ay 69.38 1.088 x ey 75.72 
xa x 52.16 54. 36 440 8 56.55 - 440 8 58.94 
De- Increment, Total Increment, Total Increment, 
gr e 1900-1905. volume. 1905-1910. volume. 1910-1915. 
Age class. Ped Ro ae 
oe Periodic annual. | 1910. | Periodic annual. | 1915. | Periodic annual 
ee ve Pasnew bao 2 A tate oye he ee ea Er 
Cubic Per Cubic Cubic Per Cubic Cubic Per 
Years. Sect. cent. fed. fed. cent. fect. fed. cent. |Trees. 
7. the a oe oO 0.078 (1) 1.81 0.124 (4) 2.67 0.172 (4) 11 
p-¢ a}: Ot Be SSS . 86 S090 ee 2} 25 ORG ose tes 6 
5 @.€ Ali: bla Ratti Seer 24 a Fie nl tae ae ee .o7 sO26cb- 2 eas 7 
2.9.2. OU etl: 2a 18 sO20n hss he .29 1022, ee ee 5 
Ti 2) Be (6) - 538 Ket 13.52 . 658 6.4 | 17. 28 . 752 5.6 12 
x 278 3.9 9.89 . 280 BPR! 11.49 -320 one rf 
xx . 166 4.2 5.65 .168 3.5 | 6.52 .174 3.1 9 
=e -148 2.6 w212 - 132 2.0 re -116 1.6 17 
P01 to. 140-..=- 5. .F 20 1.092 2.4 56.48 1.244 Zao 63.41 1.386 2-5 6 
A 5.4 . 830 2.5 43.72 904 23 48.07 . 870 2.0 4 
5.8 .426 Lb 32. 70 . 390 1.3 | 34. 60 . 380 2 4 
xxx . 246 pe 25.32 . 244 1.0; 26.42 . 220 .9 4 
eto 240... =. (9) 1. 268 1.8 82. 46 1.348 1.8}; 90.12 1.532 1.9 5 
2.0.4 476 8 61.38 -488 -5 | 64.00 ~524 .9 5 
a EN SE BE GE RETT, UDR TIES (ee T Sec eas ee Eee a) ‘eee Deen 
1 The periodic annualincrement per cent was not computed for the 21 to 60-year age class because of the 
extremely 
variations. 
smallinitial volumes and the proportionately great effect on the percentage of slight individual 
