A land without a people for a people without a land throw upon the Jews the actual manual labor of regeneration and prevent them from exploiting the "fellahin", whose numbers and lower wages are moreover a considerable obstacle to the proposed immigration from Poland and other suffering centers". In 1914 Chaim Weizmann, later president of the World Zionist Congress and the first president of the state of Israel said: "In its initial stage Zionism was conceived by its pioneers as a movement wholly depending on mechanical factors: there is a country which happens to be called Palestine, a country without a people, and, on the other hand, there exists the Jewish
Rehovot That year, Rehovot had a population of 3,193. The agricultural research station that opened in Rehovot in 1932 became the Department of Agriculture of the Hebrew University of Jerusalem. In 1933, a juice factory was built. In 1934, Chaim Weizmann established the Sieff Institute, which later became the Weizmann Institute of Science. In 1937, Weizmann built his home on the land purchased adjacent to the Sieff Institute. The house later served as the presidential residence after Weizmann became president in 1948. Weizmann and his wife are buried on the grounds of the institute. In 1945, Rehovot had a population of