Mr. Horatio Hale, who resumes the case just noticed in his address before the Anthropological Section of the American Association for the Advancement of Science (Buffalo, 1886), gives also valuable details of the language of a little four-year-old girl and her younger brother in Albany, as reported by Dr. E. R. Hun (249. 13). The chief facts are as follows: "The mother observed when she was two years old that she was backward in speaking, and only used the words 'papa' and 'mamma.' After that she began to use words of her own invention, and though she readily understood what was said, never employed the words used by others. Gradually she extended her vocabulary until it reached the extent described below [at least twenty-one distinct words, many of which were used in a great variety of meanings]. She has a brother eighteen months younger than herself, who has learned her language, so that they talk freely together. He, however, seems to have adopted it only because he has more intercourse with her than with others; and in some instances he will use a proper word with his mother, and his sister's word with her. She, however, persists in using only her own words, though her parents, who are uneasy about her peculiarity of speech, make great efforts to induce her to use proper words."
More may be read concerning this language in the account of Dr. Hun (published in 1868).
Mr. Hale mentions three other cases, information regarding which came to him. The inventors in the first instance were a boy between four and five years old, said to have been "unusually backward in his speech," and a girl a little younger, the children of a widower and a widow respectively, who married; and, according to the report of an intimate friend: "He and the little girl soon became inseparable playmates, and formed a language of their own, which was unintelligible to their parents and friends. They had names of their own invention for all the objects about them, and must have had a corresponding supply of verbs and other parts of speech, as their talk was fluent and incessant." This was in Kingston, Ontario, Canada (249. 16).
The second case is that of two young children, twins, a boy and a girl: "When they were three or four years old they were accustomed, as their elder sister informs me, to talk together in a language which no one else understood.... The twins were wont to climb into their father's carriage in the stable, and 'chatter away,' as my informant says, for hours in this strange language. Their sister remembers that it sounded as though the words were quite short. But the single word which survives in the family recollection is a dissyllable, the word for milk, which was _cully_. The little girl accompanied her speech with gestures, but the boy did not. As they grew older, they gradually gave up their peculiar speech" (249. 17).