THE EFFECT OF ELECTRICITY UPON PLANTS. 
203 
SUMMARY. 
The results of experiments with the overhead discharge system of 
electrification seems to indicate that this method has a distinct effect, 
usually favourable in character, upon the growth of plants. 
The results of experiments with Earth Currents showed occasionally 
increase in rate of plant growth, but often this method gave no definite 
effect. 
The physiological action of the current is not at all understood ; I 
am not able to support Pobacci’s view that it enables the green plant 
to elaborate starch in the dark. 
In conclusion, it only remains for me to thank others for the help 
they have given me in various parts of this work ; in particular, I wish 
to thank Miss D. Johnson for great help with the experimental work ; 
Mr. Usher for many suggestions, and Miss A. A. Irving and Miss E. M. 
Rich for various analyses they have carried out for me. 
