The practical socialists like Robert Owen and Louis Blanc and Francois Fournier were succeeded by theoretical students of socialism like Karl Marx and Friedrich Engels. Of these two, Marx is the best known. He was a very brilliant Jew whose family had for a long time lived in Germany. He had heard of the experiments of Owen and Blanc and he began to interest himself in questions of labour and wages and unemployment. But his liberal views made him very unpopular with the police authorities of Germany, and he was forced to flee to Brussels and then to London, where he lived a poor and shabby life as the correspondent of the New York Tribune. No one, thus far, had paid much attention to his books on economic subjects. But in the year 1864 he organised the first international association of working men and three years later in 1867, he published the first volume of his well-known treatise called "Capital." Marx believed that all history was a long struggle between those who "have" and those who "don't have." The introduction and general use of machinery had created a new class in society, that of the capitalists who used their surplus wealth to buy the tools which were then used by the labourers to produce still more wealth, which was again used to build more factories and so on, until the end of time. Meanwhile, according to Marx, the third estate (the bourgeoisie) was growing richer and richer and the fourth estate (the proletariat) was growing poorer and poorer, and he predicted that in the end, one man would possess all the wealth of the world while the others would be his employees and dependent upon his good will. To prevent such a state of affairs, Marx advised working men of all countries to unite and to fight for a number of political and economic measures which he had enumerated in a Manifesto in the year 1848, the year of the last great European revolution. These views of course were very unpopular with the governments of Europe, many countries, especially Prussia, passed severe laws against the Socialists and policemen were ordered to break up the Socialist meetings and to arrest the speakers. But that sort of persecution never does any good. Martyrs are the best possible advertisements for an unpopular cause. In Europe the number of socialists steadily increased and it was soon clear that the Socialists did not contemplate a violent revolution but were using their increasing power in the different Parliaments to promote the interests of the labouring classes. Socialists were even called upon to act as Cabinet Ministers, and they co-operated with progressive Catholics and Protestants to undo the damage that had been caused by the Industrial Revolution and to bring about a fairer division of the many benefits which had followed the introduction of machinery and the increased production of wealth. THE AGE OF SCIENCE