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An urgent need exists for more vary from year to year or by groups of years and the variations may trend in one direction or another over longer periods of time. Studies of such variation in forage supply by Clawson ( 1947) pointed out the need for methods of adjusting carrying capacities to fluctuations of forage caused by periods of drought or plentiful precipitation. Clawson's work showed that, in some parts of the country, fluctuations tended to be from year to year while in other areasdoi:10.2307/3894640 fatcat:uad7itrdjvf53o37hn3aj63cle