A number of tribes may be found in the district of Bilaspoor, which forms the upper half of the basin of the river Maha-Nadi--the Gonds, already mentioned, the Kanwars, Bhumias, Bingwars, and Dhanwars--all differing among themselves in physical characteristics, customs, manners, and certain religious observances. Among the Hindoos here are two tribes which deserve particular mention--the Chamars, or Chamar-wallahs, and the Pankhas. The former take their name from their dealing in "chamar," or "leather." They are the shoemaker and leather-trading castes of the Hindoo communities, and have always been held in great contempt by the high-class Brahmans and Hindoos. About sixty years ago a religious movement was inaugurated by one of the Chamars named Ghasi-Dhas. He represented himself as a messenger from God sent to teach men the unity of God and the equality of men. He was the means of liberating his tribe from the trammels of caste; he prohibited the worship of idols or images, and enjoined that prayers should be offered up to the Supreme Being, whose spirit should be ever present to their minds without any visible sign or representation. The followers of the new faith call themselves "Satmanes" or the "worshippers of Satyan, the truth." Ghasi-Dhas was their first high priest; he died 1850. His son succeeded him, but was assassinated by some Hindoo fanatic, but his grandson is the present high priest of the Chamars. The "Pankhas," or weavers, are also deists of a very high order; they are the followers of a religious reformer named Kahbir, who flourished about the fifteenth century. There is very little difference between the Kahbir-Pankhas and the Satmanes-Chamars in their worship and religion. The province of Sindh derives its name from the Sanskrit word "Sindhu," "ocean or flood," which name the Aryans of the Vèdic period who were settled about the sixth century B. C. in the Panjaub and along the Indus gave to that river. In the third "Ashtaka" and the sixth "Adhyáya" there appears to be a distinct mention of the Indus River in the twelfth verse, which runs as follows: "Thou hast spread abroad upon the earth by thy power the swollen Sindhu when arrested (on its course)."[38] The Indus is still called Sindhu throughout its course from Kalabágh to Atâk; it is sometimes locally termed Atâk. From Kalabágh to Bâhkhar is the upper Indus, and from Bâhkhar to the sea the lower Indus. It begins to rise in March and falls in September, but, unlike the Ganges and the Mississippi, it does not submerge its delta or inundate the valley through which it passes to any great extent. Its floods are irregular and partial, pouring sometimes for years on the right bank, and then on the left, so that even at the height of the freshets the Persian wheel may be seen at work watering the fields on either bank.