Journal of electricity, power, and gas . shape of this curve. Thiswill be readily appreciated when it is remembered thatany change in time of an application of the pressure,humidity, etc., will change the results secured and thegreatest care is necessary in analyzing the results ofdifferent tests. It seems that the best time of appli-cation is on cloudy days and at night. Climatic differ-ences will therefore render the results of two other-wise identical tests, very different. It will be seenthat a great deal of data is necessary and the greatest care in analyzing it or conclusions will be dra
Journal of electricity, power, and gas . shape of this curve. Thiswill be readily appreciated when it is remembered thatany change in time of an application of the pressure,humidity, etc., will change the results secured and thegreatest care is necessary in analyzing the results ofdifferent tests. It seems that the best time of appli-cation is on cloudy days and at night. Climatic differ-ences will therefore render the results of two other-wise identical tests, very different. It will be seenthat a great deal of data is necessary and the greatest care in analyzing it or conclusions will be drawn thatmay prove confusing. Tests were then carried on using a Tesla coiloutfit in place of the Wimshurst machine and whileconsiderable data has been secured it has not beenpossible so far to establish anything more than thequalitative fact that an increase in size within aboutthe same limits as with the Wimshurst machine is ob-tained. The theory at first held was that the effect shownwas due entirely to a chemical action of the current. Fig. 6. (A) Increase in size of electrified over non-elec-trified plants under stimulus of electrostati-cally stressed atmosphere. Beets. (B) Same as A except for Cauliflower. in increasing the nitrogenous content of the soil, or inthe case of atmospheric stress, the driving of nitrogenfrom the air into the ground. This theory was soonabandoned as, while the effects mentioned were experi-mentally established, the amount of nitrogen that canbe added to the soil in this way is not sufficient tobring about the results secured. A study of plant life, especially from a psycholog-ical point of view was then begun. For informationon this subject very grateful recognition is given C. Bose of Calcutta whose work, Plant Responseas a Means of Physiological Investigation, furnishedthe information that led to the clearing up of the mostperplexing points brought out by the tests. Mr. Bose established by long experiment two lawsof plant growth : 1. Dire
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