Abstract: A powder composition comprising a mixture of the di-sodium salt of 1,3-bis(2-carboxychromon-5-yloxy) propan-2-ol having a mass median diameter in the range of 2 to 4, preferably 2.5 to 3.5 microns and a solid carrier acceptable in the lungs and having a particle size in the range of from 30 to 150 microns.

Abstract: An internal combustion engine cold start device has an air valve which co-operates with a valve seat to vary the cross-sectional area of an auxiliary air supply passage upstream of a plug valve in the passage. The air valve is urged towards the valve seat by coil spring. A fuel metering orifice communicates with the passage between the two valves. The plug valve has a profiled valve member which is linked to a profiled needle which projects into the fuel metering orifice, the needle and the plug valve member being guided for rectilinear movement together along parallel paths to respectively throttle the passage and vary the area of the metering orifice. A coil spring opposes rectilinear movement of the plug valve member and the needle to reduce flow through the passage and the orifice respectivey.