Junius Henri Browne, Harper's New Monthly Magazine…
“ In health the stomach and intestines always contain a moderate quantity of gas that is nearly pure nitrogen. This appears to be secreted by the mucous membrane of the stomach and intestines, and, in excessive amount, is one of the most troublesome kinds of flatulence. The other kind arises fermentation or putrefactive change of the food, and contains carbonic acid, and sometimes sulphurated hydrogen, as well as nitrogen. ”
