ft. above, showed none of the characteristic burning effects. The 

 general physiological effects in these cases were so different from 



Fig. j. Maple tree killed by direct current from a trolley system, carry- 

 ing positive current through the rail, and return current through the feed 

 wire in contact with branches. The largest amount of burning occurred 

 slightly remote from the poiut opposite the rail, and in line with a large 

 root, lying diagoTially with, and just under the nearest rail. 



Fig. 8. Elm tree killed by a direct current from an electric railroad 

 system carrying positive current in the rail, and return current in the so- 

 called feed wire in contact with the branches. 



