THE SOUTHERN CYPRESS. 43 
TasLe 10.—Diameter of a 900-year-old cypress at the end of successive 50-year periods 
(Louisiana)? 
Time Time 
Age. Diameter. | required to Age. Diameter. | required to 
grow Linch. grow 1 inch. 
Years. Inches. Years. Years Inches. Years. 
50 6.0 8.3 500 65.8 8.6 
100 12.5 7.7 550 72.5 eo) 
150 18.5 8.3 600 79.0 ded 
200 25.9 6.8 650 84. 2 9.6 
250 32. 4 Uoll 700 87.8 13.9 
300 39. 4 Weal 750 91.2 14.7 
350 46.1 Wad 800 94.1 ere, 
400 54.0 6.3 850 98. 6 11.1 
450 60. 0 8.3 900 103. 2 10.9 
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1 Measurements at breastheight on the stump, inside bark, taken along an average radius, doubled to 
obtain diameters. Lake Maurepas region, Livingston Parish, La. Total age of tree, 915 years. 
TaBLE 11.—Diameter increase of second-growth cypress in Maryland, based on age.' 
g : i i 20 fe 
Diameter breast high. Diameter setae at 20 feet 
Age. : 
Maximum.] Average. | Minimum. | Maximum.| Average. | Minimum. 
Years.|- Inches. Inches. Inches. Inches. Inches. Inches. 
10 5.1 1.1 0.4 ta) raha ae alla Cee eee 
20 10.0 3.5 12 7.8 Peak 0.2 
30 14.2 6.2 22, 11.2 4.5 1.0 
40 17.6 8.7 3.3 13.8 6.7 1.9 
50 20.5 11.1 4.4 15.6 8.7 3.0 
60 DEKE 13.3 5.8 16.9 10. 4 4.1 
70 25.8 15.3 Ue 17.9 12.1 5.4 
80 28.6 17.3 8.9 18.9 13.6 6.9 
90 30.8 19.3 11.0 19.8 15.0 8.6 
100 Bons 21.3 13.2 20. 6 16.1 10.3 
1 Based on decade measurements on 237 stumps of trees 7 to 101 years old. 
Because of the enlarged base of cypress in very wet soils the 
breast-high diameter (4.5 feet above the ground) is not a good 
index to the volume of the tree trunk, except after middle life. At 
the height of about 20 feet (about the top of the first 16-foot log) 
the character of diameter growth is comparable with that at breast- 
height of common upland trees and serves well as an index to the 
contents of the whole treet Table 11 indicates that a butt log 
8 inches at the top end? can be grown in about 46 years, a 12-inch 
log in 70 years, and a 16-inch log in 100 years. 
The trees of the virgin forest started, as a rule, under a moderate 
or ight overhead shade, and their growth was therefore slower than 
than that of young trees either in natural stands in logged forest 
areas or. in stands thinned under intensive forest management. 
1 Diameter inside bark, allowing } inch for width of bark. 
2 The large basal swell and close utilization in milling give overruns estimated at 25 to 40 per cent, and 
more in young and deeply submerged timber. . 
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