526 MR. P. F. KENDALL ON A SYSTEM OF [ Aug. 1902, 
this be so, it will explain the occurrence of a well-defined overflow- 
channel at Stanghow, 6 miles away, which cuts the 625-foot contour 
throughout its course. It occurs in a morainic country, and at one 
point east of the village it appears to have been choked by a sub- 
sequent deposition of gravel. This is the lowest channel possessing 
an easterly drainage that I have been able to trace in the area 
north of the Cleveland Hills; and I would particularly emphasize 
the critical relation of its altitude to that of the Tranmire overflow, 
which is the lowest breach in the main watershed. Within 200. 
yards of the intake of this Stanghow channel, and a few feet lower,, 
Fig. 17.—Map of the Boosbeck valley, showing the deviation 
of the stream at Slapewath. 
jo 
we find the head of another valley running through Bushy-Dale 
Wood with a steep fall to the westward. It cuts deeply into the 
600-foot contour (see fig. 16, p. 524). It seems quite clear that in 
the same way that the direct overflow at Ewe-Crag Slack ceased its, 
operation because of the opening of the much lower Tranmire series 
of direct overflows, so Tranmire in its turn was abandoned in favour 
of some overflow to the westward. ‘The steep fall of the Bushy- 
Daie overflow shows that the main overflow to which it was related 
was at a low level, and I feel assured that it was into the Vale of 
York. Other westward-flowing channels exist on the lower slope of 
