1826 W. Henry I. 422 Carbureted Hydrogen Gas. This gas has been distinguished also by the name of..gas of marshes, hydro-carburet, proto-carburet of hydrogen.
1876 F. A. Malleson tr. J. Verne xx. 124 The temperature remained what it had been during our passage through the lava and schists. Only my sense of smell was forcibly affected by an odour of protocarburet of hydrogen.