Note 25 — Front matter (continued 2)

The Scottish factories treat three million tons of shale annually, from which the average yield is only 122.5 litres of oil to the ton, half the yield of the Canadian and American rocks. Apart from this bituminous shale, it seems unlikely that Great Britain, which controls 90 per cent. of the future production of the globe, would have succeeded in finding oil-deposits in her own soil.