22 FOREST BELTS OF WESTERN KANSAS AND NEBRASKA. 
trees have grown more rapidly in both diameter and height through- 
out thei entire lives than did the older trees. 
Tables IV, V, and VI are compiled from these stem analyses, and 
while each table is based upon only a few trees, all point in the same 
direction, furnishing strong corroborative, though not conclusive, 
evidence. Analyses of small seedlings chosen from representative 
situations also show that they are growing faster in height than did 
the older trees and at practically the same rate as the younger ones. 
TABLE [V.—Average diameter at ten-year periods of solitary rock pines at 
Muddy Gulch, Scotts Bluff County, Nebr. 
| Diameter at stump in- | : Diameter at stump in- 
side bark. | side bark. 
Age. |\~ ee Prec eT | Age. as 
60-year-old 110-year-old | 60-year-old) 110-year-old 
trees. | trees. | trees. trees. 
io a : = = — = = — 
| 
Inches. | Inches. : Inches. Tnches. 
lO :vearg = ss Le Toe 70 Viearses et. S22 Sassen eee 7.9 
20 years ...--.---------- Ba 2 Li 80 VCaTse 2 oe ee Me 8.8 
MV ORS ==er ace ee ee 5.2 3.3 || 90 years............---.- een ope 9.8 
a0 VieatS 2c 22 = ee 6.5 1.5 100 years. Be ae 10.7 
DU VOaT Seat <ao8 eee 8.0 BET ANeLLOVGEtSha eens ee |e oeree ee 11. 4 
OO MOSIPS =. ses. cce. cece 8.9 6.9 
TaBLe V.—Arerage diameter at ten-year periods of the larger trees in a stand of 
rock pine at Monroe Canyon, Siowr County, Nebr. 
Diameter at stump in- | Diameter at stump in- 
side bark. side bark. 
Age. Age. - a 
50-year-old 110-year-old 50-year-old 110-year-old 
trees. trees. trees. , | trees. 
Tniches. Inches. Inches. Inches. 
10 years _..._.._------- 1.9 L.2 | NO VGALS See ee eee 6.7 
DUTT Ee © es = ey = aw | Oi || SU VOBPSac2 22 ese ne 2 oe ee | eee qe 
30 years __..__..--- ae 5.4 5.4 || S0youre.coe = 2s ce nae elf 
40) years ._.----- : : 6.7 4.4 || "lOO veargs 25 ocean |p eo 8.0 
DU VGATA e). * oa. cueea tae 7.9 6. 3:|| LlO wears: seen ween ee 8.3 
60 years ..------- : Daerah ee 6.0 | 
TABLE VI.—Arerage height at ten-year periods of solitary rock pines at Muddy 
Gulch, Scotts Bluff County, Nebr. 
Height. 
Height. 
Age. 85-year-old 185-year-old | Age. 85-year-old) 185-year-old 
| trees. trees. trees. trees. 
Ss = = Ss - se 
Feet. Feet. | Feet. Feet. 
i. yearse. 2.52] 2.8 2 || OO CY CATS) 2a aec an soe 26. 2 19.2 
oY tears eee 6.5 4-801) (0 years: 222 sees oes 29.8 23.0 
30 rears tee ete Fo 11.1 T2100. y.Cars: 2. eee ees 33.6 26.0 
4() ae ae pee 16.6 ; LOS6 N90: V. ears) == eae ceo = aa See ee 29.6 
DUI VORTS a. 2. eee 22.0 15.0 ; 
