We remained on the surface and raced on like the very devil. How much we owed to our engines! On our arrival at Baltimore, after our long and difficult journey they had been still in perfect condition; no repairs were necessary, and we could have made the return journey immediately without their being overhauled. And yet the engines had been obliged to work under quite unknown conditions, under conditions which like that of the terrible temperature in the Gulf Stream had made the very highest and most unforeseen demands on every part of the machinery. It can be easily understood that hitherto there had been no opportunity of testing the working capabilities of oil motors in an outside temperature of 127 degrees Fahrenheit. Such a contingency could never have been foreseen in the construction of our type of boat, and the fact that our motors never struck, that not the least hitch arose, proves the excellence of the construction and the perfect workmanship of the dockyard. Thus we continued on our way, and only too soon found ourselves in the damp heated atmosphere and heavy air of the Gulf Stream, with all its beautiful phenomena and peculiarities, its electrically laden air and stormy sea. With closed hatches and heat in the boat we faced it once more. And the Stream would not even help to push us along on our course, as we had hoped. All hardships were, however, borne with light hearts this time. We had left the danger zone behind us, and were homeward bound. Moreover, the sea had become calmer the nearer we approached the area of the Gulf Stream. On the evening of the second day it had become possible to open all the deck hatches again. Hardly had we begun to rejoice that the fresh air would now make conditions below deck bearable once more, when suddenly the order came, "Close hatches!" "Submerge!" A steamer had appeared and was rapidly approaching so directly in our course that we could not possibly have avoided her above water. When we rose to the surface again an hour later night had set in, and with it appeared a most marvellous natural phenomenon of sea phosphorescence of unearthly splendour. We had submerged in a calm dark sea; we now arose to an ocean of flame. A sea phosphorescence had set in of an intensity and glow such as I had never before experienced, and which is probably only to be found on the borders of the Gulf Stream. During our rise, and when we were at about 2 fathoms below the surface, it seemed as if we were working upwards through a glowing realm of sparkling transparency. Shortly before the conning-tower arose above water I glanced round astern, and saw the entire hull of the boat, with the stern like a dark mass pushing its way through the glowing element. A fiery whirlpool radiated from the propeller, and every movement of the boat aroused the wildest phosphorescence--intensive flames, sprays of sparks, and fiery streaks in the surrounding waters.