"Castes and Tribes of Southern India. Vol. 1 of 7" by Edgar Thurston is a seven-volume encyclopedia published in 1909. Part of the British government's Ethnographic Survey of India, this monumental work documents the manners, customs, and physical characteristics of over 300 social groups across southern India. Thurston employed controversial anthropometric methods to study over 40 million people, often encountering suspicion and resistance from communities who feared his true intentions. The resulting publication became both a comprehensive ethnographic record and a subject of scholarly debate. (This is an automatically generated summary.)