An optical information recordingreproducing apparatus and are provided under a state where a focus servo is driven, a tracking error signal recorded on the recording medium or a sum signal of a photodetector is generated from a pencil of light guided onto the photodetector. The sleeve may have a lower portion sized to cover a pot and an upper portion which can surround a plant disposed in the pot and which can be detached once the protective function of the upper portion is complete or which can be used to support the sleeve from a support device prior to use. In a further alternate embodiment, an offset is provided in the drive system. A pawl is received in the first chamber detachably meshed the engaging member. The method comprises: a) heating a composition, wherein the composition comprises at least 5 percent by weight of atenolol, pindolol, esmolol, propranolol, or metoprolol, to form a vapor; and, b) allowing the vapor to cool, thereby forming a condensation aerosol comprising particles, which is inhaled by the mammal. The cooling medium is conveyed through the fuel cell by a coolant conveying device.