It is gathered that Weeden and Smith became early convinced that a great series of tunnels and catacombs, inhabited by a very sizeable staff of persons besides the old Indian and his wife, underlay the farm. The house was an old peaked relic of the middle seventeenth century with enormous stack chimney and diamond-paned lattice windows, the laboratory being in a lean-to toward the north, where the roof came nearly to the ground. This building stood clear of any other; yet judging by the different voices heard at odd times within, it must have been accessible through secret passages beneath. These voices, before 1766, were mere mumblings and negro whisperings and frenzied screams, coupled with curious chants or invocations. After that date, however, they assumed a very singular and terrible cast as they ran the gamut betwixt dronings of dull acquiescence and explosions of frantic pain or fury, rumblings of conversation and whines of entreaty, pantings of eagerness and shouts of protest. They appeared to be in different languages, all known to Curwen, whose rasping accents were frequently distinguishable in reply, reproof, or threatening. Sometimes it seemed that several persons must be in the house; Curwen, certain captives, and the guards of those captives. There were voices of a sort that neither Weeden nor Smith had ever heard before despite their wide knowledge of foreign parts, and many that they did seem to place as belonging to this or that nationality. The nature of the conversations seemed always a kind of catechism, as if Curwen were extorting some sort of information from terrified or rebellious prisoners.
Weeden had many verbatim reports of overheard scraps in his notebook, for English, French, and Spanish, which he knew, were frequently used; but of these nothing has survived. He did, however, say that besides a few ghoulish dialogues in which the past affairs of Providence families were concerned, most of the questions and answers he could understand were historical or scientific; occasionally pertaining to very remote places and ages. Once, for example, an alternately raging and sullen figure was questioned in French about the Black Prince’s massacre at Limoges in 1370, as if there were some hidden reason which he ought to know. Curwen asked the prisoner—if prisoner it were—whether the order to slay was given because of the Sign of the Goat found on the altar in the ancient Roman crypt beneath the Cathedral, or whether the Dark Man of the Haute Vienne Coven had spoken the Three Words. Failing to obtain replies, the inquisitor had seemingly resorted to extreme means; for there was a terrific shriek followed by silence and muttering and a bumping sound.
None of these colloquies were ever ocularly witnessed, since the windows were always heavily draped. Once, though, during a discourse in an unknown tongue, a shadow was seen on the curtain which startled Weeden exceedingly; reminding him of one of the puppets in a show he had seen in the autumn of 1764 in Hacker’s Hall, when a man from Germantown, Pennsylvania, had given a clever mechanical spectacle advertised as a “View of the Famous City of Jerusalem, in which are represented Jerusalem, the Temple of Solomon, his Royal Throne, the noted Towers, and Hills, likewise the Sufferings of Our Saviour from the Garden of Gethsemane to the Cross on the Hill of Golgotha; an artful piece of Statuary, Worthy to be seen by the Curious.” It was on this occasion that the listener, who had crept close to the window of the front room whence the speaking proceeded, gave a start which roused the old Indian pair and caused them to loose the dogs on him. After that no more conversations were ever heard in the house, and Weeden and Smith concluded that Curwen had transferred his field of action to regions below.