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its use, which I have seen. In the cemetary at Centerville, situated about 3 1/2 miles southerly from Niles. There are four dresses monuments of this stone, the oldest of which appears to have been erected in 1852, and is yet in a perfect state of preservation, showing no signs of disintegration or decay. Its surfaces are smooth; the arrises or corners clean and sharp, and the lettering is perfect as when originally chiseled. Its base show the original marks of the dressing tools, all of which appearances indicate a strong and durable stone, resistant to influences of air and weather. The other, but later monuments, show the same characteristics. This stone was also used for the abutments and piers of the railroad bridges crossing Alameda Creek, several of which I examined, finding the masonry in fine condition, except about the base courses, which showed a small amount of wear induced by the action of sand and gravel put in motion by the high water of the floods.
No. 2. Is what is termed "gray stone," being of darker hue than the above, from which it is separated in position by a slight swale in the hill. The deposit can be traced about 800 feet in a northerly direction, and at least 200 feet above the bed of the creek.
In regard to stratification and uniformity of color, it agrees with No.1. I examined in place one block which had been exposed by clearing away its overlaying soil, finding it to measure 55 feet in length, 10 feet in thickness, extending into the ledge to an unknown distance of which 8 feet were in