said introducing and mixture forming means comprising {TAIL ~ a wax medium} containing {HEAD ~ octenol}, said medium having a porous exterior for allowing gaseous octenol to escape and mix with discharged carbon dioxide in the housing 
said introducing and mixture forming means comprising { TAIL ~ a wax medium } containing { HEAD ~ octenol } , said medium having a porous exterior for allowing gaseous octenol to escape and mix with discharged carbon dioxide in the housing
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH