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LITHGOW OSBORNE DIVISION OF FISH AND GAME COMMISSIO R STATE OF NEW YORK WILLIAM C. ADAMS STAT OFNEW ORKDIRECTOR JOHN T. GIBBS JUSTIN T. MAHONEY DEPUTY COMMISSIONER F , ASSISTANT DIRECOR J. V. SKIFF JOHNSECRETARY L NSUPT. OF INLAND FISHERIES SSUMNER M. COWDEN SUPT. OF FISH CULTURE EMMELINE MOORE, PH.D. CHIEF AQUATIC BIOLOGIST GARDINER SUMP CONSERVATION DEPARTMENT SUPT. OF GAME HENRY A. TEAL SUPT. OF LAW ENFORCEMENT ALBANY (7) JAMES H. HILDRETH SUPT. OF MARINE FISHERIES August 16,1943. Professor Aldo Leopold, 424 University Farm Place, Madison,Wisconsin. Dear Professor: I am decidedly tardy in replying to your letter of Tuly 18th. Will have to blame it on field work and time spent trying to pry nominating petitions out of the members of the S.A.F. The data on red paine are most interesting. The fidelity with which the curves for Madison and Stephentown follow each other tends to confirm the idea that the pattern of growth curves (at least for softwoods) is a specific constant. Too bad we couldn't have had data from Pennsylvania,too. I would attach relatively little significance to differences in amount of growth. My specimens were small trees alnog the windward edge of a plantation where the dominant trees average 20 feet. They were the only ones small enough for convenient measurement. However,the site is too well-watered for typical red pine site,was originally Hemlock-Hard Maple. Red pine has a c.a.i. of 20 inchesusually. Without more data,I would not hazard a guess as to why your trees were 10 days earlier than mine. The season here has been very backward,as has yours. The climates are about the same,modified continental here being only slightly different from your unmodified continental. Latitude of Stephentown is 420 30' pluswhile yours approximates 430 -- not much difference there. Current rainfall seems to make little differencefor the pines grow with food stored from the provious year. That reduces the possible factors pretty sharply,leaves only current temperatures. Weather station records have their limitations. I have tried summing excess temperatures over 420 and many another dizzy trick,but never could get a correlation; differences sometimes as wide as 1000%. I have a thordly unscientific hunch thet the governing factor determining the onset of terminal growth is light,as controlled by the length of day. The minor fluctuations may be due to local combinations of teiperkture,both soil and air. There is a wide-open field here for some bright young forester.