<Hole, cavity, excavation, pit, cache, cave, cavern, hollow, depression, perforation, puncture, rent, slit, crack, chink, crevice, cranny, breach, cleft, chasm, fissure, gap, opening, interstice, burrow, crater, eyelet, pore, bore, aperture, orifice, vent, concavity, dent, indentation.

" They returned to their work day after day, and, in a short time, found a fissure in the rock, which enabled them to pass far with very little obstruction.

He noticed a fissure above the level of the water.

I descended the other face of the rock, and then, through a second ragged fissure, to the summit of another pinnacle.

We arrived at a second set of French custom-houses, deserted, and then we saw that the gigantic side of the mountain was cleft by a fissure from base to summit.

These were grouped in three categories, namely: 1. Gash Veins; 2. Segregated Veins; 3. Fissure Veins; and were defined as follows: Gash Veins.

Bedded veins may be distinguished from fissure veins by the absence of all traces of a fissure, the want of a banded structure, slickensides, selvages, etc.; from gash veins and the floors of ore which often accompany them, as well as from segregated veins, they are distinguished by the nature of the inclosing rock and the foreign origin of the ore.

Bedded veins may be distinguished from fissure veins by the absence of all traces of a fissure, the want of a banded structure, slickensides, selvages, etc.; from gash veins and the floors of ore which often accompany them, as well as from segregated veins, they are distinguished by the nature of the inclosing rock and the foreign origin of the ore.

Where such sheets of ore occupy by preference the planes of contact between adjacent strata, but sometimes desert such planes, and show slickensided walls, and banded structure, like the great veins of Bingham, Utah, these should be classed as true fissure veins.

First, the great diversity of character exhibited by different sets of fissure veins which cut the same country rock seems incompatible with any theory of lateral secretion.

The Humboldt is a narrow fissure carrying a thin ore streak of high grade, consisting of sulphides of silver, antimony, arsenic, and copper; the Bassick is a great conglomerate vein containing tellurides of silver and gold, argentiferous galena, blende, and yellow copper; the Bull Domingo is also a great fissure filled with rubbish containing ore chimneys of galena with tufts of wire silver.

The Humboldt is a narrow fissure carrying a thin ore streak of high grade, consisting of sulphides of silver, antimony, arsenic, and copper; the Bassick is a great conglomerate vein containing tellurides of silver and gold, argentiferous galena, blende, and yellow copper; the Bull Domingo is also a great fissure filled with rubbish containing ore chimneys of galena with tufts of wire silver.

On the other hand, Becker supposes the concentration to have been effected by surface waters flowing laterally through the igneous rocks, gathering the precious metals and depositing them in the fissure, as lateral secretion produces the accumulation of ore in the limestone of the lead region.

Hence it seems much more natural to suppose that the great sheets of ore-bearing quartz now contained in the Comstock fissure were deposited by ascending currents of hot alkaline waters, than by descending currents of those which were cold and neutral The hot springs are there, though less copious and less hot than formerly, and the natural deposits from hot waters are there.

If, as we have supposed, the fissure was for a long time filled with a hot solution charged with an unusual quantity of the precious metals, nothing would be more natural than that the wall rocks should be to some extent impregnated with them.

If the ore were derived from the trachyte, it should be at least somewhat alike in the two mines, should be more generally distributed in the Horn Silver fissure, and might be expected to give out at, no great depth.

From what has gone before it must not be inferred that lateral secretion is excluded by the writer from the list of agencies which have filled mineral veins, for it is certain that the nature of the deposit made in the fissure has frequently been influenced by the nature of the adjacent wall rock.

The proximity of heated masses of rock has promoted chemical action in the same way as do the Bunsen burners or the sand baths in the laboratory; but no case has yet come under my observation where it was demonstrable that the filling of a fissure vein had been due to secretion from igneous or sedimentary wall rocks.

I have never given up hope of finding somewhere in the walls a fissure of some kind of which the pirates are ignorant and through which I could make my escape.

They travelled without further interruption or mishap, until they drew near to the open water, when suddenly they came upon a deep fissure or crack in the ice about four feet wide, with water in the bottom.

Some great fissure in his nature had long needed thus to be filled.

Instead he stood waiting; his red-rimmed eyes travelling from man to man, the fissure between them deepening, the heavy lids narrowing, moment by moment.

From side to side of his throne there is a long fissure, which opened, so says tradition, when the Jât Rajah, Jawahar Singh of Bharatpur, in 1765, set his usurping feet on the throne of the Great Mogul.

I acquainted myself with the black inhabitants of metallick caverns, and, in defiance of damps and floods, wandered through the gloomy labyrinths, and gathered fossils from every fissure, At last I began to write, and as I finished any section of my book, read it to such of my friends, as were most skilful in the matter which it treated.

The Surprise at the Post Illustrations: With his rifle ready Rob approached the fissure (Frontispiece) Knifefightheem killed!