some British officials criticised these exercises as being little more than a caricature of the reality of caste system in India. The colonial officials used the census-determined jatis to decide which group of people were qualified for which jobs in the colonial government, and people of which jatis were to be excluded as unreliable. These census caste classifications, states Gloria Raheja, a professor of Anthropology, were also used by colonial officials over the late 19th century and early 20th century, to formulate land tax rates, as well as to frequently target some social groups as "criminal" castes and castes prone to "rebellion". The population then comprised about 200 million people, across five major religions, and over 500,000 agrarian villages, each with a population between 100 and 1,000 people of various age groups, which were variously divided into numerous castes. This ideological scheme was theoretically composed of around 3,000 castes, which in turn was claimed to be composed of 90,000 local endogamous sub-groups. The strict British class system may have influenced the British preoccupation with the Indian caste system as well as the British perception of pre-colonial Indian castes. British society's own similarly rigid class system provided the British with a template for understanding Indian society and castes. The British, coming from a society rigidly divided by class, attempted to equate India's castes with British social classes. According to David Cannadine, Indian castes merged with the traditional British class system during the British Raj. Race science Colonial administrator Herbert Hope Risley, an exponent of race science, used the ratio of the width of a nose to its height to divide Indians into Aryan and Dravidian races, as well as seven castes. Enforcement Jobs for forward castes The role of the British Raj on the caste system in India is controversial. The caste system became legally rigid during the Raj, when the British started to enumerate castes during their ten-year census and meticulously codified the system. Between 1860 and 1920, the British incorporated the caste system into their system of governance, granting administrative jobs and senior appointments only to the upper castes. Targeting criminal castes and their isolation Starting with the 19th century, the British colonial government passed a series of laws that applied to Indians based on their religion and caste identification. These colonial era laws and their provisions used the term "Tribes", which included castes within their scope. This terminology