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Mary Rose Barrington, Ian Stevenson and Zofia Weaver, A World in a Grain of Sand: The Clairvoyance of Stefan Ossowiecki,  2005.
Appendix I - Experiments Reported in Ossowiecki's Autobiography; 

Archaeological Experiment 7 (Source: Ossowiecki,1933, pp. 212-fi)  1925 (1 November).
The experimenter placed a relatively large gray stone in Ossowiecki's hands. Ossowiecki described another planet, with plains and rocks of purple color, strange cypress-like black trees and transparent forms similar to humans, enormous expanses and rusty-iron colored giants flying through space, scattering into small pieces. After the session the experimenter revealed that the stone was a meteorite; in fact none of the experiments described here exclude the possibility of telepathy being involved.

 Archaeological Experiment 2 (Source: Ossowiecki,1933, pp. 211-12)  1925 (27 November).
The object given to the clairvoyant was a piece of dried mud wrapped in a rag. Ossowiecki described, in some detail, a place which was destroyed suddenly, being deep down-possibly in the cellars, a one-story white house where gatherings used to take place with both men and women taking part, a kind of church with everyone singing. The piece of mud came from the temple of Mithras from under the church of St Praxeda in Rome.

 Archaeological Experiment 3 (Source: Ossowiecki,1933, 212-14)  1926 (3 January).
The experimenter put a marble fragment into Ossowiecki's hands. Ossowiecki's description included details of architectural features of a large building, the altar, the ceremony taking place and the appearance of the participants.  The stone came from the ruins of the temple of Castor and Pollux, and according to the experimenter Ossowiecki's account was consistent with the historical evidence.

Archaeological Experiment 4 (Source: Ossowiecki,1933, 214-15) 1926 (probably 14 January).
On being given a few pieces of earth crust to hold, Ossowiecki described a town which had been destroyed by natural disaster and buried in the mass of the same material.  The experimenters, who gave Ossowiecki a piece of lava from the Vesuvius eruption, had hoped to have a description of the geological events taking place during the volcanic explosion.