Further discoveries in Lake Zürich were not so speedily effected as in some of the other Swiss lakes, and for a few years the interest in this subject was transferred to more distant localities. In the following year, 1855, Colonel Schwab visited Zürich and made further researches at Männedorf and Ober-Meilen. From the latter he succeeded in securing a considerable number of objects, especially stone hatchets, some of which were made of nephrite, and a bronze celt of the flat type (=Fig. 1=, No. 5). In 1858, in the course of some dredging operations for the purpose of deepening the mouth of the Limmat, fragments of pottery, bits of piles, and some peculiar beams having one or two square-cut holes (=Fig. 2=, Nos. 13 and 14) were dredged up. Dr. Keller recognised here the site of a Pfahlbau which extended both under the little island called Bauschanze and outwards towards the lake. (B. 22 and 336.) Two other localities near the outlet known as the "Kleiner Hafner" and "Grosser Hafner" were also proved to have been stations. The former was opposite the north end of the Tonhalle, and about 150 yards distant from the original shore. It occupied a circular area of about 1½ acre in extent and, when the water was low, its surface was only some 3 feet submerged. The Grosser Hafner was farther off in the lake, and its area was considerably larger than that of the Kleiner Hafner. On a clear day in both these localities stones and the tops of piles could be seen. Another locality known to Dr. Keller at this early period was about two miles from Zürich, on the west shore of the lake and just opposite the steamboat pier at Wollishofen. Here the lake-bed consisted of a deposit of fine mud, and owing to the constant commotion made by the steamers in passing to and fro the _débris_ of the lake-dwelling had been greatly covered up. (B. 336.) [Illustration: Plan of Lake-dwellings in ZURICHSEE, PFAFFIKERSEE, GREIFENSEE & ZUGERSEE.] As the Kleiner Hafner lay directly along the course followed by the steamers, and greatly obstructed their passage, the authorities, in 1867, resolved to have the obstruction removed altogether. For this purpose a dredging machine was used, by means of which a segment several feet thick was removed from its surface. During this operation the same kind of perforated beams which had already attracted attention at the Bauschanze were turned up among the stuff, together with numerous objects of flint, stone, bone, etc., similar to those at Ober-Meilen (=Fig. 2=, Nos. 9 to 17). In addition to these, however, there were bronze axes of the winged type, some spoon-shaped crucibles, large clay rings and fragments of pottery of an unusually fine kind (=Fig. 2=, Nos. 1 to 8). But, what was considered still more strange, there were among these relics some iron weapons and Roman tiles.