TABLE OF CONTENTS. 



Introduction, 1 



Electrical resistance of trees, 2 



Effects of alternating currents, 5 



Effects of direct currents, 6 



Death of trees from direct currents, 8 



Electrolysis, 11 



Lightning, 12 



Earth discharges, 13 



Susceptibility of different trees to lightning stroke, ... 14 



Methods of preventing injury to trees from wires, .... 15 



Summary, 18 



Approved by 

 The State Board of Publication. 



