Middle-class women, barred from higher education, began to monopolize the profession of primary-school teaching. As teachers, they read more, communicated more, and education itself became subversive of old ways of thinking. They began to write for magazines and newspapers, and started some ladies' publications. Literacy among women doubled between 1780 and 1840. Women became health reformers. They formed movements against double standards in sexual behavior and the victimization of prostitutes. They joined in religious organizations. Some of the most powerful of them joined the antislavery movement. So, by the time a clear feminist movement emerged in the 1840s, women had become practiced organizers, agitators, speakers.