Fig. I. Cross section of box showing form given to the rock filling put in. 



Fig. 2. Plan to $how the series of spurs i-8 on each side of the valley, also pool and 

 Its outlet. 



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 r. m., Feb. 21. 'o? ; Fig. 4, at V40 ; Fie 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 ni by ledges on the spur nn 

 which has here been encountered by the stream. .' c t- 



