Professor T. G. Bonney — Eroded Rocks in Corsica. 389 



perhaps 400 feet above the sea.' Along this I strolled for a short 

 distance to enjoy a yet wider view ; the slope rising rather 

 steeply on one hand, occupied partly with tillage, partly with 

 trees, but showing here and there a small knoll or boulder of 

 granite, and descending on the other hand, being overgrown, in the 

 immediate neighbourhood, with herbage and trees.^ On this slope, 

 and a short distance below the road, my eye was attracted by 

 a block of granite, apparently a boulder several cubic yards in 

 volume, on the lower part of which was a curious excavation. 



Fig. 1. — HoUoAV iu Granitic block, outer 

 surface dotted. A, mouth of inner 

 hollow ; B, hole into it. 



Fig. 2. — Section along the 

 line C-D in Fig. 1. 



The annexed sketches (Figs. 1 and 2), though very rough, for the 

 subject was difficult to draw, will save a long description. The 

 hollow (as the section in Fig. 2 shows) was on rather the under 

 side of the boulder, against which a smaller one was lying. From 

 C to D (Fig. 1) was about 30 inches (estimate), and the deepest 

 part (at A) perhaps 16 inches. From this, however, a funnel-like 

 cavity went upwards with a circular opening into it at B, about 

 2 inches in diameter. Holding the head of my hammer, I thrust 

 the handle up the funnel till its end passed this opening. How 

 much higher it may go I cannot say, for when I have a defective 

 knowledge of the aggressive fauna of a country I am not over 

 curious in exploring dark hollows. The part drawn looked roughly 

 west, and on the opposite side of the block was a smaller hollow. 



A few yards lower down the slope a block of granite, measuring 

 rather more than a yard one way and a little less the other, is built 

 into a low wall. On its surface are no less than eleven basin- 

 like hollows, most of them about 4 inches in diameter ; two being 

 from 8 to 10 inches deep, and others 4 or 5 inches. As I scrambled 

 downwards through the wood I saw many more hollows, either 

 in boulders or in outcrops of granite, sometimes one, sometimes 

 several on a block. Some were mere 'potholes' like those made 

 by water, others short channels, rudely resembling the cast of 

 a slug, which not seldom deepen in one part to a kind of basin ; 



^ Perhaps it was part of the Salario Eoad. I had no map of Ajaccio. 

 2 The majority were wild olives, as Sir "W. T. Thiselton - Dyer, after examining 

 a specimen, has kindly informed me. 



