Thus in the hands of Chierici almost every feature of the terramara deposits excited fresh interest and an eagerness for further inquiries. Piles or their traces were found almost immediately in all the stations wherever they were carefully looked for. In 1872 Chierici and Mantovani explored two stations, one at Monte Venere and the other at Monte, in which were found not only the dyke surrounding the basin and palafitte, but, in one of them, three series of piles, one superimposed above the other, thus clearly showing that when the spaces around the piles and underneath the platform had got filled up with _débris_, a second palafitte had been resorted to, which in its turn had been succeeded by a third. (B. 233 and 247.) It was on all hands acknowledged that in many parts the peculiar stratification of the layers in certain beds could only be accounted for on the supposition that water had somehow to do with the sorting of their ingredients, as floating materials, such as bits of charcoal, were often eliminated and formed separate layers. So far Chierici's theory might be taken as offering a complete explanation of the phenomena. But the deposition of the higher portions of the mound remained to be accounted for, as it was difficult to conceive of pools of water at the requisite heights. A still more formidable objection was the impossibility of transporting water without the intervention of a system of hydraulics to sites placed on elevations far above the level of any adjacent streams, and of this class several had been known, as at Monte Venere, Roteglia, Castellaccio, etc. (B. 407, p. 9); yet, in most cases, they also contained the palafitte and dyke. This was the weakest part of the theory and found few supporters, but in other respects every additional discovery only tended to confirm it. Strobel, however, declined to believe in the universality of either dykes or palafittes. Thus, writing in 1874 (B. 267), he says: "At the conclusion of an article which I wrote in 1872 on shells of _Unio_ found in the marière, etc., I asserted that the terremare, those prehistoric settlements, were terrestrial; that in some of them man lived in pile-dwellings on dry ground, in others he dwelt in tents or huts; and that in some of the terramara beds earthworks can be seen, which may have been used as dykes or bulwarks, and which in all probability were fortified with ditches." After showing how impossible it would be for the terramaricoli of Roteglia and Castellaccio to have pools of water at such an elevation as they had been, he goes on to say: "And here I may be permitted to raise my voice against those who imagine that prehistoric men, and more especially those of the marière, and of our terremare and pile-dwellings of the Bronze Age, always and everywhere followed constantly one uniform and invariable order in arranging their abodes, as if they were inferior to the animals, nay, even to the invertebrates, who modify