IRGENHAUSEN.--Only one other settlement has been recognised as a true lake-dwelling in this lake-basin, viz. Irgenhausen, situated about half an hour's walk to the east of Robenhausen. The station ran parallel to the shore for a distance of about 300 feet, with a breadth of only 30 feet. The relics found on it are similar in character to those from Robenhausen, the most remarkable of which are specimens of embroidered cloth and checked muslins. (B. 126, Pl. xvi. Fig. 2 and 2a.) Messikommer believes that only one row of cottages occupied this site. Almost the whole site of this lake-dwelling has disappeared into the depths since 1881, and can no longer be found.[23] Only a yawning deep (_eine gähnende Tiefe_) is now to be seen where formerly stood the remains of the Pfahlbau. This phenomenon is, however, not singular in the Swiss lakes, as evidence of which we have the recent catastrophe in Lake Zug, which demolished not only the site of a prehistoric lake-dwelling, but also a large part of the town of Zug. [Illustration: =Fig. 25.=--ROBENHAUSEN. All ⅔ real size.] Close to the water's edge on the south shore, and about ten minutes' walk directly north of Robenhausen, there is an artificial mound called Himmereich, which formerly was supposed to be the site of a pile-dwelling. It is constructed of small and large stones, among which flint saws, arrow-points, and pottery of the lake-dwelling type, were found associated with Roman tiles and pottery (_terra sigillata_). There were, however, no piles or any evidence of structural dwellings, and the opinion now generally held in regard to it is that it was a pre-Roman Refugium, which subsequently fell into the hands of the Romans.[24] Remains of a Roman station are also close to Irgenhausen, which might have something to do with the Himmereich mound. (B. 462.) The records of the numerous discoveries made at Robenhausen from time to time, according to the favourableness of the weather, are, like the relics themselves, widely scattered. In addition to the reports of Keller and J. Messikommer (B. 22, 34, 40, 61, 126, 336, and 462) in the proceedings of the Society of Antiquaries of Zürich, we have a number of further notices in various journals, such as _Anzeiger_, _Antiqua_, _Das Ausland_, etc. (B. 143a and 143b, 154, 256, 383, 385a and 385b, 402, 403, 406c and 406d, 434c, 449b, 454b, etc.), from which more or less important information is to be gleaned. EGELSEE, NEAR FRAUENFIELD.