When all was in readiness, Professor Morse seated himself at the instrument, and sent his first message to Baltimore. An answer was promptly returned, and messages were sent and replies received with a rapidity and accuracy which placed the triumph of the invention beyond the possibility of doubt. Congratulations were showered upon the inventor, who received them as calmly as he had previously borne the scoffs of many of these same men. Yet his heart throbbed all the while with a brilliant triumph. Fame and fortune both rose proudly before him. He had won a great victory, and conferred a lasting benefit upon his race. The success of the experimental line brought Professor Morse numerous offers for the use of his invention. Telegraph companies were organized all over the country, and the stock issued by them was taken up as fast as offered. At the present day, not only the United States, but the whole world, is covered with telegraph lines. In July, 1862, just eighteen years after the completion of Morse's experimental line, it was estimated that the lines then in operation throughout the world amounted to an aggregate length of 150,000 miles. The Morse system is adopted on the principal lines of the United States, on all the lines of the Eastern continent, and exclusively on all the continental lines of Europe, "from the extreme Russian north to the Italian and Spanish south, eastward through the Turkish empire, south into Egypt and northern Africa, and through India, Australia, and parts of China." The rapid growth of the telegraph interest of the United States placed Professor Morse in the possession of a large fortune, which was greatly increased by the adoption of his invention in Europe. The countries which had refused him patents at first now did honor to his genius. Nor was he the only gainer by this. In France, especially, the benefits of his invention were great. The old system of semaphore telegraphs had been an annual expense to the government of that country of 1,100,000 francs, but Morse's telegraph yielded to the French Government, in the first three years after its introduction, a total revenue of 6,000,000 francs.