Museum curators are well aware of the risk of damage when moisture-sensitive objects are exposed to variations in relative humidity. The Ancient Japanese Treasures scheduled for exhibition at the Royal Ontario Museum in Toronto in May, 1966 included folding screens decorated in gold and color on paper; wooden figures, some of them polychrome; lacquer work; and painted scrolls of silk or paper. Measures were taken twelve months in advance to providea physical environment comparable to the climate of Tokyo. Additional humidification was provided; absence of fungus growth under the moist conditions was attributed to the use of paraformaldehyde within the packing of the objects during transport. -- AATA