1905.] 



PUBLIC DOCUMENT — Xo. 33. 



17 



Table II., Experiment n. (^Raphanus sativus L.). — Shoiving the Re- 

 sults obtained by electrically charging the Air in a Case — Concluded. 



The results given in tables I. and II. are quite similar. 

 In Table I. there Avas a gain of 55.98 per cent, in the weight 

 of tops or leaves and 65.67 per cent, in the weight of roots, 

 over the uncharged plants ; in Table II., the percentage given 

 for the tops is 42.73 and for the roots 49.46. The total gain 

 in Experiment I. is 57.(57 per cent. ; in Experiment II. it is 

 45.58 per cent. The average gain in both experiments was 

 49.35 per cent, for the tops or leaves, 57.56 per cent, for 

 the roots and 51.62 per cent, as an average total gain for the 

 electrically stimulated plants. The charge in Experiment I. 

 averaged 167.2 volts; in Experiment IL, 141.2 volts. The 

 charge only lasted a few seconds in all instances, and prac- 

 tically disappeared from the atmosphere of the case in fifteen 

 minutes. 



Some measurements were occasionally made of a dozen 

 typical plants from each case in Experiment I. The object 

 in taking these measurements was, first, to show the differ- 

 ence in size and degree of acceleration, diff'erentiation , etc., 

 of the treated and untreated plants; and, second, to com- 

 pare the electrically treated plants with those that were not 

 treated, when the latter were practically in the same stage 

 of development ; or, in other words, the plants in the elec- 

 trically charged case were compared with those in the un- 

 treated case on the day in which the measurements were 

 made, and also five days later, Avhen the development of the 

 normal plants had reached practically the same stage as tliat 

 of the plants in the electrically treated ease. B}^ this method 

 any changes in the external configuration of the })lants 

 brought about by electrical stimulation could be noted. 



