Zamenhof did his first project "Lingwe uniwersala" (Universal Language) in 1878. But his father, a language teacher, regarded his son's work as unrealistic. So, he destroyed the original work. Between 1879 and 1885 Zamenhof studied medicine in Moscow and Warsaw. In these days he again worked on an international language. In 1887 he published his first textbook ' ("The International Language"). According to Zamenhof's pen-name ' ("Doctor who hopes"), many people started calling the language as "Esperanto".