The tip rock is used for building purposes and all or much of the dolomite is thrown away because of its soft nature. Much of the batlulni is also thrown away, the compact blue layers only being used for cement of which they now turn out about 50 barrels per day but can make over 100 barrels each day. The Eurypteridae are not very abundant and it is understood that the one must turn in to the office all found. Some however get away one of which I purchased for $2.50 a fair specimen showing the perfect anatomy. I found some Perediptia alta and probably the little Orthithete of Hall. It is said that the elder Bennett has the good Eurypteridae. Aug. 18 Spent Sunday at Niagara Falls.