This report contains findings on lime mortar samples collected for examination from walls and bas-reliefs of a late-Renaissance tenement-house, called At St. Christopher's, in the marketplace of the town of Kazimierz on the river Vistula in Poland. On the grounds of these findings, propositions concerning technology and preparations of the lime mortars of the best appropriateness and similar in their structure, content and constituents to the old ones have been put forward. Proofs on the elevation were executed by Mrs. K. Trzeciak, conservator and sculptor, in the summer of 1983. Their state of preservation is good.