Io8 SOME NOTES ON ARBOR LOW AND OTHER LOWS. 



at midsummer ? If this were so, an approximate date for the 

 construction would be ascertainable. I put this with great 

 diffidence. 



From my knowledge of the climate, I have no hesitation in 

 saying that the selection of the site was an undertaking requiring 

 many years (perhaps hundreds) of observation. This appeals 

 to me as being quite as great an achievement as its material 

 construction. 



Having been much impressed by the angles I have noted, 

 I applied them to a convenient low adjoining Ashbourne on the 

 Old Hill. This low is on the northerly slope of the hill, and 

 is happily placed for obser\'ation, as it is not much blocked 

 by trees or buildings. 



There is nothing noticeable 30° east of north. The view 

 south is blocked. 



On the line 30° west of north there is a very marked depres- 

 sion in the hills against the sky line, formed by the eastern slope 

 of the pyramid-shaped hill, Thorpe Cloud, and the western 

 slope of Sharplow. This line is nearly horizontal, but not so 

 nearly as the parallel line from Arbor Low. Somewhat to the 

 east of this line I found a low near the top of Hinchley Wood. 

 I was much puzzled that this should be so much out of the line, 

 but from its own point of view the lowest part of the hollow 

 between Thorpe Cloud and Sharplow is exactly 30° west of 

 north. Still nearer the hollow, Broadlow, from its name and 

 position, probably had another low with a similar bearing 30° 

 west of north. An old quarrj^ may account for its destruction. 



Following the reverse line from the Old Hill, 30° east of 

 south, I found three lows near Tinker's Inn, which probably 

 have the bearing 30° west of north to the Thorpe Cloud and 

 Sharplow depression ; but I cannot state it positively, as trees 

 and buildings are in the way. 



I can, if necessary, give many more instances of lows which 

 {not being on the tops of pointed hills) have sky line depressions 

 bearing 30° west of north. Perhaps it is sufficient to say that 

 I have found for myself, without having received any information 



