26 BULLETIN 426, U. S. DEPARTMENT OF AGRICULTURE. 
important than the total heisht. Because of its straightness, a very 
large proportion of the bole of a sugar pile can be utilized. Further- 
more, the ee Ens a the crown fall off at a comparatively 
ly ving an unusuai clear length averagme 50 feet in nature 
ae inft requeenth y ee 80 feet. A table, based on a 
large number of actual measurements, showing the merchantable 
length or trees of various diameters and heights will be found in the 
DIAMETER GROWTH. 
ines of th 
he largest diameters are found on the best sandy 
loam soils in fairly op 
for 
ree 
en situations. Trees in dense forest, in compe- 
tition with others light, are obliged to devote their energy to 
height growth lar “Tabl ie 17 shows maximum, average, and 
minimum ee ee on age in virgin stands. 
dp 
0 
99 
bec 
S 
TasLe 17.—Minimum, average, and maximum growth in diameter, on basis of age, 
California. 
t 1% 
. | Diameter breast-high outside | Diameter breast-high outside 
bark, in inches. bark, in inches. 
i ; 
Aga. lai inl ccs ata oe Age. 
Maxi- | Mini- | Maxi- | Mini- 
| mum, |e.) mum. | mum. | Average.| mam. 
Years Years 
Dis a A | 0:42): see Ds 2 a60r es Bia ay | 60.1 44.9 32.4 
BUS Soo Sse = Py a Ps st | fees es See ea 63.5 | 47.2 a4. 3 
NS eae a he BA ad a SS ee ees | 66.9 49.3 36.1 
ee ae |= I6sy, 13.0 pe) | eS aes ek eas: peers | 51.4 37.9 
BN) Ree SRS: SS j 24.1 181 | 12.6 SIG Ae: bee ee 73.3 53.9 39.5 
cE ah eee ees i 30.4 22.7 16.2 Bit peat | ee ee | 76.1 ae a, eee 
TAR ee ok 35. 26.8 19.2 SOD se cae [eke oo ae BY Ge ae eee 
ice eee See } 40:3 30.5 | 21.8 ABQUAE oo 2 EIS, ee ee SOA ile Saas 
PREF GEE | 44.9 33.9 24.2 ata |————— — 
(1 ae ee ae 49.1 37.0 26. 4 Number ofj| 
ZENS o> Som eee } 52.8 49.9 | 28. 6 stump an aly- | 
ae”. See | 385 425 | 30.5 Sie. hs | | 328 | 474 22 
I | 
iv 
The measurements upon which Table 17 is based were taken for 
the purpose at showing the effect of locality uper diameter growth 
rather than the effect of various factors, such as soil, light, and mois- 
ture, withm a given locality. The maximum measurements were 
secured among dominant trees within the western central Sierras, 
the best range of the species. The minimum measurements were 
taken among the same ciass of trees in Siskiyou County, northern 
California, toward the limit of the range. The average was obtained 
by averaging the measurements taken in eight ieee throughout 
the State. The effect on the growth of unfavorable factors within a 
given locality approximates the effect of an unfavorable change m 
latitude or aititude, however; therefore, the average growth shown 
¥ the tables is indicative of the growth that trees somewhat crowded 
r light, or growing on poorer soils, might make in a more central 
te rtion of the range of the species. In the same way, the mmimum 
