>>Which gets me back to my method of producing CO2. I'm curious to know why >>your comment about it was, "very funny". >> > >You meant you were serious? It seemed like such an inefficient way of >injecting CO2, considering the low concentration of CO2 in your breath. I thought you were kdding too. In our CPR course, we were told there is enough O2 in our breath to sustain another person thus mouth to mouth recessitation. Harold