392 



Dhler and Browning — Electrolysis and 



the relative position of the anode was such that if it were 

 drawn on the page it would be represented hy a straight line 

 parallel to the upper edge of the sheet and cutting across the 

 tops of figures 3a and 3b. Figure 3e shows the upper sur- 



Fig. 3. 



faces of three of the large branches broken from the pair of 

 trees. These surfaces always have a medial groove apparently 

 caused by the convection currents of hydrogen bubbles which 

 stream upward in sheets from the outer edges of each branch. 



