An apparatus adapted to disseminate volatile liquid into an atmosphere comprises a reservoir containing volatile liquid and a liquid transfer member that transfers liquid from the reservoir to the atmosphere via an orifice in the reservoir. The reservoir orifice is closed by a puncturable membrane, and the transfer member is mounted adjacent to the orifice on the side of the membrane remote from the liquid and adapted such that it can be pushed through the puncturable membrane into, and then held in contact with, the liquid in the reservoir, to permit the flow of the liquid from the reservoir to the atmosphere. The liquid transfer member preferably comprises capillary channels. The apparatus has the advantage of being leakproof in transit.