412 Dr. Henry Woodward — Photography in Geology. 



fall is 70 feet high over the Whin Sill, which is here intrusive id 

 the Lower Yoredale Beds. 



A photograph by Mr. Godfrey Bingley (No. 1912) representing 

 the upper course of a stream — " High Cup Gill," near Appleby, 

 Westmoreland — is described by Professor E. J. Garwood (on p. 15). 

 It depicts a typical V-shaped valley, joining that of the Eden from 

 the eastern side. The Gill is excavated in the Lower Carboniferous 

 beds against the dip of the strata (down the scarp side), and the old 

 ■dip-valley, draining down eastward to the Tees, is seen on the right 

 side of the photograph. 



Another example of Mr. E. Welch's fine Irish photographs is 

 (p. 10.) "iV?). 963. Pot-hole in Basalt, Glenariff, Co. Antrim. 



This is a very typical example of a circular hole in the bed of a stream drilled by 

 means of pebbles swirled round in eddies of the water when the stream carries an 

 ample current. The hard pebbles are probably provided by the Boulder-clay in the 

 neighbourhood of the glen. Such holes are remarkably circular in plan, Avith their 

 sides well smoothed and polished, while the pebbles become ovoid and very well- 

 rounded. Fm-ther down stream there are other very deep pot-holes, and gorges 

 ■excavated partly by pot-hole action. A scale is given by the vegetation. 



W. W. Watts and R. "Welch." 



At p. 14 Professor James Geikie, Chairman of the Committee, 

 describes (No. 1815) a small photograph, which we could wish was 

 larger, but which will no doubt make an admirable lantern-slide, 

 representing the historical Parallel Eoads of Glenroy, looking 

 N.N.E. from the northern slope of Bohuntine Hill, about half a mile 

 south of Achavady, Argyllshire. 



"Photographed by W. Lamond Howie ; 1896. 



The ' Parallel Roads ' are narrow terraces or benches, 40 to 50 feet in width, 

 running horizontally and parallel to each other along the mountain slopes. They are 

 not flat, but have an incKnation of 12° to 20° or thereabouts. They consist chiefly 

 of angular detritus of local rocks, mostly overgrown with vegetation. Originally 

 considered by Darwin and others to be sea-beaches, they are now generally admitted 

 to mark the successive levels of a glacier-dammed lake. The ' roads ' are seen in 

 this view on the east side of the glen, at heights of 1,153, 1,077, and 862 feet 

 respectively, heights which correspond with three cols, one at the head of the main 

 glen, one on a left-hand tributary, Glen Glas Dhoire, and one at the head of Glen 

 Laggan, into which the lowest ' road ' passes. 



Jambs Geikie and "W. Lamond Howie." 



Did space and means permit, we should like to present to our 

 readers reproductions of all of these excellent and instructive pictures 

 with their accompanying descriptions, but instead we strongly 

 recommend them to send a guinea to Professor W. W. Watts, M.A., 

 Sec. G.S., Holmwood, Sutton Coldfield (Secretary of the British 

 Association Geological Photographs Committee), who will cause 

 to be sent to them 20 unmounted platinotypes with appropriate 

 letterpress — or, still better, they may engage to send one guinea 

 annually. For 30s. they will receive 20 mounted platinotype views 

 on cards, and for £1 5s. 20 lantern-slides with letterpress may 

 be obtained. 



We cannot conceive of a more delightful pi-esent to make to 

 a young, or old, geologist than one or both of the above charming 

 series, or 20 annually as a birthday or New Year's gift ! 



