. Annual report. Agricultural education. 70 EXPERIMENT STATION. [Jan. The age of the tree, obtained by counting the annual rings, was found to be one hundred and thirty-one years, and the height, which was estimated after the tree was felled, was be- tween 115 and 125 feet. The south and east radii showed the greatest development. This is not surprising, since the light conditions are 10 or 15 per cent, more favorable in the morn- ing than in the afternoon, and there naturally occurs more photosynthetic activity and therefore more growth on the south- east side of the tree than on any other si
. Annual report. Agricultural education. 70 EXPERIMENT STATION. [Jan. The age of the tree, obtained by counting the annual rings, was found to be one hundred and thirty-one years, and the height, which was estimated after the tree was felled, was be- tween 115 and 125 feet. The south and east radii showed the greatest development. This is not surprising, since the light conditions are 10 or 15 per cent, more favorable in the morn- ing than in the afternoon, and there naturally occurs more photosynthetic activity and therefore more growth on the south- east side of the tree than on any other side. Careful measure- ments were made of the annual rings in decades by Sumner C. Brooks, and the results of these measurements, showing the grand period of growth, are shown in Fig. 1. By studying the CM. II 10 9 8 7 6 5 4 3 2 I 0 0 10 -20 30 40 50 60 70 80 90 100 .110 120 130 YRS Fig. 1. — Showing grand period of growth of elm tree, Ulmus Americana, L. The figures on the ordinates represent centimeters, and those in the abscissae, years. curve it will be seen that the maximum period of growth oc- curred between the tenth and thirtieth years, following which there is a gradual decline in the decade growth, as might be expected. Even between the one hundred and twentieth and one hundred and thirtieth year the growth in thickness of the trunk indicated considerable vigor and was about two-thirds that which occurred between the first and tenth year. There were a few small, dead branches on the tree, and a. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Massachusetts Agricultural College; Massachusetts Agricultural Experiment Station; Massachusetts Agricultural Experiment Station. Annual report of the Hatch Experiment Station of the Massachusetts Agricultural College. Boston : [s. n. ]
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