Yet in the terms themselves there is, generally, nothing which indicates that they imply an idea of consanguinity. Professor Buschmann has given us a very interesting list of the names for father and mother in many different languages.[444] The similarity of the terms is striking. “Pa,” “papa,” or “baba,” for instance, means father in several languages of the Old and New World, and “ma,” “mama,” means mother. The Tupis in Brazil have “paia” for father, and “maia” for mother;[445] the Uaraguaçú, respectively, “paptko” and “mamko.”[446] In other languages the terms for father are “ab,” “aba,” “apa,” “ada,” “ata,” “tata”; those for mother, “ama,” “emä,” “ana,” “ena,” &c. According to Buschmann, there are four typical forms of words for each of these ideas: for father, “pa,” “ta,” “ap,” “at”; for mother, “ma,” “na,” “am,” “an.” Sometimes, however, the meaning of the types is reversed. Thus, in Georgian,[447] as well as in the Mahaga language of Ysabel,[448] “mama” stands for father; whilst the Tuluvas in Southern India call the father “amme,” and the mother “appe.”[449] The terms used often fall outside of the types mentioned. In the Lifu tongue, for example, one term for father is “kaka;”[450] in the Duauru language of Baladea, “chicha”;[451] in the Maréan tongue, “chacha” or “cheche.”[452] Again, among the Chalcha Mongols and some related peoples, mother is “ekè.”[453] In the Kanúri language, of Central Africa, the mother is called “ya”;[454] while the Kechua in Brazil call the father “yaya.”[455] Among the Bakongo, as I am informed by Mr. Ingham, “se” means father; in Finnish, “isä.” Again, by the Brazilian Bakaĭri, the mother is called “ise”;[456] and, by the people of Aneiteum, New Hebrides, “risi.”[457] Similar terms are often used for other relationships. The Greek, “πάππος” signifies grandfather, and “μάμμα” grandmother. In the Kanúri language, “yaya” stands for elder brother;[458] and, in Lifuan, “mama” and “dhina” are terms for brother, whilst mother is “thine.”[459] The origin of such terms is obvious. They are formed from the easiest sounds a child can produce. “‘Pa-pa,’ ‘ma-ma,‘ 'tata,’ and ‘apa,’ ‘ama,’ ‘ata,’” Professor Preyer says, “emerge originally spontaneously, the way of the breath being barred at the expiration, either by the lips (_p_, _m_), or by the tongue (_d_, _t_).”[460] Yet the different races vary considerably with regard to the ease with which they produce certain sounds. Thus the pronunciation of the labials is very difficult to many Indians,[461] on account of which their terms for father, mother, or other near kinsfolk, often differ much from the types given by Professor Buschmann.