602 KANSAS CITY REVIEW OF SCIENCE. 
that are to form the lateral edges, as well as the part that is to form the back. It 
is placed on the edge of the chisel in such a manner that the convex surface of 
the flint which rests on the forefinger of the left hand is turned towards that tool. 
Then with the disc hammer he applies slight strokes to the flint just opposite the 
edge of the chisel underneath and thereby breaks it exactly along the edge of the 
chisel. 
6. The stone is then turned and the edge of its tapering end is placed upon 
the chisel, and the process of trimming and sharpening is completed by five or 
six slight strokes of the disc hammer. 
The whole time of making a gun-flint occupied less than a minute. If 
the flint balls are good a workman will manufacture i,ooo flints in a day, but 
if the quality is poor about 500. 
I do not know whether there have been any manufactories of gun-flints in 
the United States ; certainly they were manufactured in Europe, especially in 
England. 
The worked "flints" of the stone age, although generally termed "flints," 
were made of various kinds of silicious rock including common flint, chert, horn- 
stone, quartzite, chalcedony, agate, porphyry, jasper, and obsidian. 
The California Indians readily manufacture glass bottles into arrow-heads. 
The arrow points found in Missouri are of quartzite, chert, hornstone, and 
porphyry, but chiefly of chert, generally of a white color, but sometimes reddish 
tinted, others are brown, black, or gray, or bluish and white. 
I have found localities where evidently a number had been made, for the 
flints were in every stage of perfection; some very perfect, others from which 
only a few flakes had been chipped off. Pits have been found where the pre- 
historic people had probably quarried flints, for they did not seem to be old 
mineral shafts, no mineral at present being found there. 
NOTE ON A NEW MINERAL TO CENTRAL KANSAS. 
WARREN KNAUS. 
In November, 1882, while in Saline County, my attention was called to a 
crystallized mineral supposed to be a form of gypsum. I took a specimen to the 
Agricultural College and it proved on analysis to be Celestite (Sulphate of Strontia) 
— a mineral then Httle known in the State, and not found in Prof. Mudge's Cata- 
logue of Kansas Minerals. 
The locality in which the mineral is found is the SE. ^ of Sec. 30, T. 14 
S. and R. 2 W., being, on the extreme western edge of the Permian Group, 
bounded at this point by the Smoky Hill River. 
The Celestite occurs in crystals, in the strata of the limestone, dipping at 
some points to the surface of the water, and rising at other points from ten to 
twenty feet above the surface. The mineral also occurs in massive nodules in 
