"I have had the advantage of the finest telescope in the world, your Majesty," replied Lennard, with a smile, "and of course I have published no details. There was no point in creating a panic or getting laughed at before it was necessary. But now that the orbit has altered, and the catastrophe will come so much sooner, any further delay would be little short of criminal. In fact, we have to-day telegraphed to all the principal observatories in the world, giving exact positions for to-night, corrected to differences of time and latitude. We shall hear the verdict in the morning, and during to-morrow. Meanwhile we are going to Greenwich to get the observatory there to work on my calculations, and if your Majesties would care to appoint an officer of sufficient knowledge to come with us, and see the comet for himself, he will, I am sure, be quite welcome." "A very good suggestion, Mr Lennard," said Lord Kitchener, "very." "Then," replied the Tsar, quickly, "as astronomy has always been a great hobby with me, will you allow me to come? Of course, you have my word that I shall see nothing on the journey that you don't want me to see." "We shall be delighted," said the British envoy, cordially, "and as for seeing things, you will be at perfect liberty to use your eyes as much as you like." The Tsar's august colleagues entered fully into the sporting spirit in which he had made his proposal, and a verbal agreement to suspend all hostilities till his return was ratified in a glass of His Majesty of Austria's Imperial Tokay. CHAPTER XXXVII THE VERDICT OF SCIENCE Although the Tsar had made trips with John Castellan in the _Flying Fish_, he had never had quite such an aerial experience as his trip to Greenwich. The _Auriole_ rose vertically in the air, soared upward in a splendid spiral curve, and vanished through the thin cloud layer to the north-eastward. Twenty minutes of wonder passed like so many seconds, and Admiral Hingeston, beside whom he was standing in the conning-tower, said quietly: "We're about there, your Majesty." "Greenwich already," exclaimed the Tsar, pulling out his watch. "It is forty miles, and we have not been quite twenty minutes yet." "That's about it," said the Admiral, "this craft can do her two miles a minute, and still have a good bit in hand if it came to chasing anything." He pulled back a couple of levers as he spoke and gave a quarter turn to the wheel. The great airship took a downward slide, swung round to the right, and in a few moments she had dropped quietly to the turf of Greenwich Park alongside the Observatory. Lennard's calculations had already reached the Astronomer Royal, and he and his chief assistant had had time to make a rapid run through them, and they had found that his figures, and especially the inexplicable change in the orbit, tallied almost exactly with observations of a possibly new comet for the last two months or so.