The first known document of correspondence teaching dates back to 1723, through the advertisement in the "Boston Gazette" of Caleb Phillips, professor of shorthand, offering teaching materials and tutorials. The first testimony of a bi-directional communication organized correspondence course comes from England, in 1840, when Isaac Pitman initiated a shorthand course, wherein he sent a passage of the Bible to students, who would send it back in full transcription. The success of the course resulted in the foundation of the phonographic correspondence society in 1843. The pioneering milestone in distance language teaching was in 1856 by Charles Toussaint and Gustav Langenscheidt, who began the first European institution of distance learning. This is the first known instance of the use of materials for independent language study.