A glaring mistake was made in regard to the explosion that killed the cook and propelled him through the window. The cause was explained as ethylene gas having built up at the bottom of the tank and then being set off by a gunshot. In actual fact, ethylene gas is lighter than air (density of 0.97 compared to air with a density of 1.0), indeed the only anesthetic gas that is lighter than air, and therefore it would NOT build up at the bottom of the tank. In fact, it would rise to the top of the tank and build up there if the tank is closed on top. That property, added to the fact that ethylene is so highly explosive over a wide range of mixtures in both air and oxygen and also the fact that its onion like odor is reasonably objectionable led to its discontinuation as a viable anesthetic agent as soon as cyclopropane became available.