Mr. McKay, too, in his article previously quoted, gives some interesting figures which tend to recall the gloomy days of rationing cards, and help us to realise how deeply we are indebted to Commander Burney and his paravanes for assuring us to the bitter end our daily, if slightly curtailed, means of subsistence. "It is computed," writes Mr. McKay, "that the total loss in shipping due to submarine warfare is about £1,000,000,000. Hence, working on the certainties, each submarine destroyed was responsible for about £5,000,000 worth of damage. Accepting this figure as a basis, it may be said that the explosive paravanes saved further damage being inflicted on our shipping to the extent of about £25,000,000." Reverting next to the protector paravane, "there were," we are told, "about 180 British warships fitted with the installation. Assuming that the value of warship tonnage is placed at the very low average figure of £100 per ton, the value of the ships saved was above £50,000,000;" and a further point which cannot be ignored is that undoubtedly "the moral effect of the loss of these vessels would have been stupendous." Again, in regard to merchant ships, "if the ratio mines cut ------------ ships fitted for these were only one quarter the ratio for warships, the saving to the nation would be about £100,000,000 sterling's worth of merchant ships and cargoes." Finally, "from all the records available, the Allied countries are indebted to the paravane invention for saving ships and cargoes to the value of approximately £200,000,000. In addition, the number of lives saved must be a very large figure." Few and far between are the prophets who have any honour in their own country, and Admiral Sir Percy Scott proved no exception to the rule when, prior to the war (cp. the _Times_, June 5th, 1914), he wrote that "the introduction of vessels that swim under the water has, in my opinion, entirely done away with the utility of the ships that swim on the top of the water."