talc-like clay which underlies the Alloway clay. A sample was tested with the following results: Water required for tempering, 38.5 per cent.; air shrinkage, 5 per cent.; tensile strength not tested, probably very low. It gave the following results when burned: Both the Alloway clay and this talc-like clay are discussed more at length in connection with the clays of Salem county. Clay-working Industry. There is only one brickyard in Gloucester county, viz., the one mentioned south of Woodbury. clay-working plants in the county. Aside from this there are no HUDSON COUNTY. No clay deposits are being worked in this county, but there are several factories which are supplied chiefly by clays from Middlesex county. J. H. Gautier & Co. have a factory in Jersey City and produce some fire brick and graphite crucibles. Porous white-ware cups for electrical purpose are made by W. Ross, of Jersey City. The same class of goods are also produced by Thos. Loughran of Marion, N. J. G. C. Pedric's brickyard, Flemington, showing soft-mud machine and molding gang at the right, and drying sheds with movable roofs. The white smoke between the two kiln sheds is the water-smoke or steam from the bricks. Clay bank at the same brick works showing the shallow character of the clay which was derived by wash from the steep hill on the right. HUNTERDON COUNTY. The clay deposits of Hunterdon are not extensive, but so far as known, are limited to local accumulations due directly to the disintegration of the underlying rock or to wash from steeper slopes. In the latter case, the clay is usually residuary material which has been transported at most only a few hundred yards from its source. Lambertville.-A small deposit of ferruginous brick clay derived directly from the decomposition of trap rock is worked on the hill about one mile southeast of Lambertville (Loc. 277). It is rather shallow and contains numerous large bowlders, the disintegrated portions of the rock (Pl. XXIV, Fig. 1). Although the brickyard is a small one and worked intermittently, bricks have been made in this vicinity from this clay since 1816. There is no likelihood of finding an extensive deposit on this ridge, but clay similar in amount and character probably occurs at many points along the top of Sourland mountain between Lambertville and Neshanic. The material burns red and has a low fire shrink age. Flemington.-A bed of loamy clay ranging from 3 to 7 feet in thickness is worked at Flemington (Loc. 276), for the manufacture of common brick (Pl. XLIV, Figs. 1 and 2). The lower portion of the clay was derived directly from the Triassic red shale, while the upper few feet, which contain occasional pebbles of trap rock, were derived by wash from the steep slopes of a hill of trap rock a few rods west of the clay pits. Both clays are used and burn to a product of good red color and hard body, but they are too gritty for use in draintile. The physical properties of this material are as follows: Water required, 23.9 per cent.; air shrinkage, 3.5 per cent. Average tensile strength 159 pounds per square inch. The sample burned as follows: Cone Burning tests of a clay from Flemington, Pedrick's yard. Fire shrinkage, Absorption, Color, Condition, |