Up to very recent times the peasant who rented his land paid 40-50 per cent of the produce to the landowner, who was responsible for payment of the normal land tax.

She says: "Up to 30 I see the numbers in clear white; to 40 in gray; 40-50 in flaming orange; 50-60 in green; 60-70 in dark blue; 70 I am not sure about; 80 is reddish, I think; and 90 is yellow; but these latter divisions are very indistinct in my mind's eye.

The blast required has been experimentally determined at 40-50 cubic meters per minute at 15 lb. pressure.