Fig. i. Cross section of box showing form given to the rock filling put in. 
Fig. 2. Plan to show the series of spurs 1-8 on each side of the valley, also pool and 
its outlet. K 
Figs. 3 8. Successive positions of the channel in the process of aggradation 
i=pile of clay. 
Fig. 3 shows position of channels at 3:30 p. m., Feb. 2r. ’07: Fig. 4, at 3-40- Fig s 
at 3:45; Fig. 6, at 3:55; Fig. 7, at 4:05 ; Fig. 8, at 4:15. 
Fig. 9. A, B and C are terraces defended at t and m by ledges on the spur n n 
which has here been encountered by the stream. 
