A telegram from Wilhelmshaven, dated the 11th inst., states that the Imperial third class cruiser _Zietan_ has arrived here apparently in difficulties, in charge of two tugs. Captain Schloss immediately landed and despatched a lengthy report to the German Admiralty, but, as shore leave is refused, our correspondent is unable to obtain details of the accident from any of the officers or crew. We have reason to believe that a serious disaster has taken place on board. Later.----From the master of the tug _Vulkan_ we learn that the cruiser _Zietan_, while two hundred miles west of Heligoland, suddenly encountered a violent and unprecedented magnetic storm. Practically every electric wire on board was fused, the wireless gear was hopelessly broken down, and the compasses rendered absolutely useless. The _Zietan_ was, in fact, instantaneously reduced in fighting value to below that of a cruiser of thirty years ago. It is stated that the ship is still highly charged with electromagnetism, and will have to go into dock for a lengthy period. Captain Schloss was heard to express his doubts that the cruiser would ever be fit for sea-service again. Gerald Tregarthen read this report with more than ordinary interest. At first he was inclined to scoff at the intelligence. It savoured too much of a fairy story, while it was more than possible that the master of the German tug had been, to use a nautical term, "pumped." Even in his somewhat brief career the sub-lieutenant had experienced several severe electrical storms in the tropics, but the ship's compasses and delicate electrical gear had never been seriously affected. This new danger, should it be repeated, threatened to increase the trials and troubles of the navigator a thousandfold. "By George!" he exclaimed suddenly. "I must wire to Jack Stockton, or he'll wonder what's happened. But where shall I wire to? It's no use addressing it to the yacht--the post office people will keep the telegram till called for. I have it. I'll wire to Stockton, care of station-master, Poole." Accordingly Tregarthen strolled over to the post office, discharged his mission, and returned to the dreary platform. At length the long-drawn hour passed, and, taking his seat in a first-class carriage, the sub-lieutenant steeled himself to endure the discomforts of a tedious journey. At Southampton West his supply of literature was exhausted, so a sixpenny novel and a copy of a London evening paper were purchased. Occupying a prominent position in the newspaper was a further report from Reuter's agent in Wilhelmshaven:--