Abstract: The invention relates to a device for analysing the effects of at least one parameter related to a volatile substance on a living test system, characterised in that it comprises: an enclosure (1) composed of a first compartment (20) comprising a gas inlet (21) and a gas outlet (22), and a second compartment (30) in which the test system and the volatile substance are located, the first (20) and second (30) compartments communicating with each other through an opening (11) fitted with a semi-permeable membrane (40) adapted to limit a flow of volatile substance from the second compartment (30) to the first compartment (20) in a determined manner, while allowing a gas flow from the first compartment (20) to the second compartment, (30), and the second compartment (30) being hermetically sealed such that the only exchanges with an outside medium take place towards the first compartment (20), through the membrane (40).