Journal of electricity, power, and gas . f a distantpoint and this causes a wave of positive turgidity va-riation to be transmitted to the roots increasing theirfunctional activity. In other words, it is a direct stimu-lation of a distant point. Hertzian waves, as light, are a direct stimulus andretarded growth as would be expected, but the aftereffect is to increase growth rate. From the results of Boses work and the tests here-in described the following principles have been estab-lished. 1. The direct stimulation of a distant point, indirect stimulation of the root or plant induces a
Journal of electricity, power, and gas . f a distantpoint and this causes a wave of positive turgidity va-riation to be transmitted to the roots increasing theirfunctional activity. In other words, it is a direct stimu-lation of a distant point. Hertzian waves, as light, are a direct stimulus andretarded growth as would be expected, but the aftereffect is to increase growth rate. From the results of Boses work and the tests here-in described the following principles have been estab-lished. 1. The direct stimulation of a distant point, indirect stimulation of the root or plant induces a wave of positive turgidity variation and thus in-creases the functional activity of the organs if they arefar enough from the point of application of the stim-ulus to avoid the effect of direct stimulation. 2. Though the immediate effect of direct stim-ulation is to cause a negative turgidity variation andretard growth it increases -the internal energy of theplant and the after effect is to increase the growthrate. .6/3S 0073 QOJT ooas. _32 2L 3* •& j*. 34- \ as 37 j» 3& Fig. Effect of temperature on excitability ofCirnum Lily. 3. Plants are very sensitive to fatigue and thestimulation must be of such degree and duration thatfatigue is avoided if the net result of the treatment isto be beneficial. It should be noted how uniformly the curves in-dicate this fatigue effect, Figs. 1 and 6. It is alsoshown in the effect of alternating current in the soil,indicating that the stimulative effect of a given alter-nating current in the soil is greater than that of thesame current density of direct current. It is earnestly hoped that investigators more ad-vantageously equipped will continue these and otherexperiments in this field establishing or altering theabove theory so that we may have definite principlesby which the effect of a given stimulus may be pre-dicted with the accuracy obtainable in scientific andengineering work. Panama Canal excavation aggregates, accordingto the most
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