We were encouraged to persevere, however, by perceiving some little light proceeding from the farther end.

We at length squeezed our way for about thirty feet, and found that the aperture was a low and regularly formed arch, having a bottom of the same impalpable powder as that in the main chasm.

A strong light now broke upon us, and, turning a short bend, we found ourselves in another lofty chamber, similar to the one we had left in every respect but longitudinal form.

Its general figure is here given.
The total length of this chasm, commencing at the opening a and proceeding round the curve _b_ to the extremity _d_, is five hundred and fifty yards.

At _c_ we discovered a small aperture similar to the one through which we had issued from the other chasm, and this was choked up in the same manner with brambles and a quantity of the white arrowhead flints.