ONE of the results of the scarcity of petrol has been that inquiry has been stimulated into other possible fuels for power purposes on motor vehicles. Benzol, being- a home-produced fuel, would have been an admirable alternative, but the entire output is already required for other more urgent purposes. Alcohol, too, could have been used, had it been available, but too little is produced in this country to meet the demand, even if other difficulties had not stood in the way. The only available alternatives are paraffin and illu minating gas. Paraffin can be used quite well on slow-moving vehicles, provided that the load is reasonably steady, and that a small quantity of petrol is available for starting- the engine with reasonable dispatch; but this, again, is not home-produced.