Hauntings may be visual, auditory, or confined to the sense of touch. Auditory effects are produced by flutterings of air, noises are caused, steps are heard, laughter, and moaning. Lares domestici (brownies) mostly make a noise. Apparitions may be in tactile form of men or animals, or monsters. As for effects, some ghosts push the living and drive them along, as the Bride of Lammermoor, in Law's Memorialls, was 'harled through the house,' by spirits. The spirits of an amorous complexion seem no longer to be numerous, but are objects of interest to Thyraeus as to Increase Mather. Thyraeus now raises the difficult question: 'Are the sounds heard in haunted houses real, or hallucinatory?' Omnis qui a spiritibus fit, simulatus est, specie sui fallit. The spirits having no vocal organs, can only produce _noise_. In a spiritual hurly-burly, some of the mortals present _hear nothing_ (as we shall note in some modern examples), but may they not be prevented from hearing by the spirits? Or again, the sounds may be hallucinatory and only some mortals may have the power of hearing them. If there are visual, there may also be auditory hallucinations. {133} On the whole Thyraeus thinks that the sounds may be real on some occasions, when all present hear them, hallucinatory on others. But the sounds need not be produced on the furniture, for example, when they seem to be so produced. 'Often we think that the furniture has been all tossed about, when it really has not been stirred.' The classical instance of the disturbances which aroused Scott at Abbotsford, on the death of his agent Bullock, is in point here. 'Often a hammer is heard rapping, when there is no hammer in the house' (p. 82). These are curious references to phenomena, however we explain them, which are still frequently reported. Thyraeus thinks that the air is agitated when sounds are heard, but that is just the question to be solved.