But what made Lenine more determined in his revolutionary activities was a tragedy which happened in the family when he was only seventeen years of age. It was then, in 1887, that his elder brother, also a student in the Petrograd University, was arrested for suspected complicity in a revolutionary plot and, after a secret trial, was condemned to death and hung. Like all men of his type, Lenine was intensely emotional and this tragedy in his life made a deep impression on him and was probably one of the chief factors in determining him to devote his whole career to the revolutionary movement. By this time he had become a convert to the Socialist theories of Karl Marx, and thenceforth he spent all his spare time spreading the propaganda among the working people. At the same time he also continued his studies of economics and various kindred subjects. At the age of twenty-five he published his first essay, "The Economic Significance of the People's Movement." Four years later appeared a historical treatise, "The Development of Capitalism in Russia," just at the moment when two important factions in the general revolutionary movement were carrying on a controversy as to whether the economic development of Russia would be the same as in western Europe. Even as the result of mere research the work was a scholarly masterpiece and was regarded as one of the landmarks in the literature of Russian industrial development. It was not long before Lenine's activities caused him to become involved with the police, and not only was he compelled to change his name often, as did all revolutionists, but he was finally forced to leave Russia and could only return on short visits on false passports. Most of his time abroad was spent in Switzerland, France, and Austria. Naturally, he took an active part in the disturbances of 1905, but did not specially distinguish himself, as it was the Social Revolutionists with their program of terrorism who were the most energetic during that period. Then followed the reaction and little was heard of Lenine or his Bolsheviki for a while. But in 1911, when Russian revolutionary activities showed signs of reawakening, Lenine and his associates founded the prominent Socialist daily paper, "Pravda," and took up their propaganda work with renewed activity. In 1913 the Leninites had developed such strength that they were able to elect six representatives to the Duma.