The pueblos of Santa Clara, Cochiti, San Juan, Tesuke, &c., manufacture large quantities of pottery for sale in addition to that made for their own use. It is in these eastern pueblos that the black polished ware is chiefly found, and it is in the production of this class of ware that the chief difference in the ceramic art between the two sections exists. The clays used in the manufacture of this ware are of the same character as those of which the other is made; the paste is prepared in the same way, so that when the vessels are formed and ready for the kiln they are of the color of the original clay. In other words, the change to the black color is not produced in making the paste or in moulding or forming the vessel, but during the process of baking. The manner of forming the vessel is the same as with the western tribes; and when, formed it is dried in the sun in the same way; after this a solution of very fine ochre-colored clay is applied to the outside and inside near the top, or to such parts of the surface as are to be polished. While this solution thus applied is still moist, the process of polishing begins by rubbing the parts thus washed with smooth, fine-grained stones until quite dry and glossy. The parts thus rubbed still retain the original red color of the clay. The vessels are again placed in the sun and allowed to become thoroughly dry, when they are ready for baking. It is in this part of the process that the great differences in color are produced. The vessels are placed together in a heap on a level spot of ground and carefully covered over with coarsely broken dried manure obtained from the corrals. The kiln thus formed is then ignited at several points. It is proper to add here that the clays used by the Santa Clara Indians are of a brick-red color, containing an admixture of very fine sand, which, no doubt, prevents cracking in burning, and hence dispenses with the necessity of using lava or pottery fragments, as is the custom of the Indians of the western pueblos. The burning is carried on until a sufficient degree of heat is obtained properly to bake the vessels, which still retain their original red brick color. At this juncture such of the vessels as it is desired have remain in that condition are removed from the fire and allowed to cool, when they are ready for use. Those which the artists intend to color black are allowed to remain and another application of fuel, finely pulverized, is made, completely covering and smothering the fire. This produces a dense, dark smoke, a portion of which is absorbed by the baking vessels and gives them the desired black color. It is in this manner that the black ware of these eastern pueblos is produced.