The “Indian God-Rock,” 115 miles north of Pittsburg, Pennsylvania, on the Alleghany River, was next examined and sketches were made of the figures. This rock is an immense bowlder, the sculptured face of which is about 15 feet high and from 8 to 10 feet broad, and lies at the water’s edge. The figures upon the lower surface are being gradually obliterated by erosion from floating logs and driftwood during seasons of high water, while those upon the upper portions are being ruined by the visitors who cut names and dates over and upon the sculptured surfaces. Another place visited was on the Susquehanna River, 3 miles below Columbia, Pennsylvania. Here a small stream empties into the river from the east, along whose course several rocks were found bearing deeply cut and polished grooves, indicating a nearly east and west direction. These rocks are believed to be on the line of one of the Indian trails leading to the Delaware River, similar to that at Conowingo, Maryland, which was the last locality inspected, and which is known as “Bald Friar.” A large mass of rock projecting from the bed of the river is almost covered with numerous circles, cup-shaped depressions, human forms, and ellipses, strongly resembling characters from other points in the regions formerly occupied by the Algonquian family. Measurements and sketches of these petroglyphs were made, with a view to future reproduction upon models. OFFICE WORK. The Director, Maj. J. W. POWELL, has continued the work of the linguistic classification of the Indian tribes in North America north of Mexico, and in connection with it is preparing a map upon a linguistic basis showing the original habitat of the tribes. The work is now far advanced. Prof. CYRUS THOMAS, as previously stated, has devoted much of his time during the year to the study of the collections made, and in preparing for publication the account of field work performed by himself and assistants. That account will form the first volume of his final report, and will consist almost wholly of descriptions, plans, and figures of the ancient works examined, narrative and speculation being entirely excluded. It will also include a paper by Mr. Gerard Fowke on the stone articles of the collection. The second volume will be devoted to the geographic distribution of the various types of mounds, archeologic maps and charts, and a general discussion of the various forms and types of ancient works. The preliminary lists of the various monuments known, and of the localities where they are found, together with references to the works and periodicals in which they are mentioned, which Mrs. V. L. Thomas, in addition to her other duties, has been engaged upon for nearly three years, is now completed, and is being used in the preparation of maps. It will be issued as a bulletin.