84 A. FE. Verrill—The Bermuda Islunds; Geology. 
original purity of color. The entrance is near the top of a wooded 
hill somewhat south of the Harrington House, toward Castle Harbor. 
There is a large, dry, cultivated sink to the northward of it. The 
entrance is nearly perpendicular and barely large enough for a man 
to enter, it being only the wider part of a fissure. The fissure 
expands below to form the cave. The floor and roof both slope 
rapidly downward for about 80 feet. The open space is at times 
more than 50 feet wide. The height of the roof varies from 4 or 5 
up to 10 or 15 feet. It is thickly covered in most places with mul- 
titudes of rather small stalactites, though large ones occur. These 
stalactites are still forming. Water was dripping from most of them. 
Many of the small and very slender ones were tubular and porous at 
the end, and had a drop of water hanging there, in which, with a 
lens, loose or but slightly attached crystals of calcium carbonate 
could be seen forming.* 
In the bottom of this cavern there is a pool of very clear sea- 
water, about 8 to 10 feet deep, so that it goes below the devel of 
Harrington Sound and Castle Harbor to that depth, but the connec- 
tion with the sea is probably only by small crevices. No fishes live 
in it. 
At several points on the west shore of Castle Harbor, opposite the 
Peniston Cave and others of this vicinity, several streams of clear 
salt water flow out from holes and crevices in the beach, exposed at 
low tide. Some of them are like springs, and of considerable volume. 
The water may come from the caves, or even from Harrington Sound. 
Such localities are excellent for collecting marine invertebrates. 
The whole neck of land between Harrington Sound and Castle 
Harbor seems to be cavernous. Sharks Holet at the southeast cor- 
ner of Harrington Sound is a cavern in the form of a deep archway, 
partly submerged beneath the water, so that a boat can row in 50 feet 
or more. The bottom is covered with large broken rocks, among 
which many fishes may often be seen. ‘The water under the arch is 
rarely more than 10 to 12 feet deep. Among other we!l known 
caves in this vicinity are Cooper’s Cave and Paynter’s Cave ; 
Joyce’s Cave, near Coney Island; Convolvulus Cave; and the Wals- 
ingham Caves. 
* See these Trans., pp. 438, 471, pl. xciii, figs. 1, 2; ‘‘ The Bermuda Islands,” 
pp. 26, 59, pl. xciii, figs. 1, 2. 
+ Its location is at S. H. on mapII. See these Trans., xi, p. 488, pl. lxxiii; 
“‘The Bermuda Islands,” p. 26, pl. Ixxviii. 
{ See these Trans., xi, pp. 470, 471, plates xc-xcii ; ‘‘ The Bermuda Islands,” 
pp. 58, 59, same plates. 
