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Synopsis The study of human evolution and also of human variation are two major focuses of Anthropology. Spatio-temporal variation among human population due to genetic and environmental causative factors is an important objective of physical anthropology. The present treatise is probably the first attempt to write on the biological variation at micro-level among the Koch population, a detribalized caste population. The author’s attempt is to trace any significant regional variation in their physical characters and to reveal any definite clustering pattern. The author’s concern is also to examine if the results of the genetic investigation support the conclusions drawn from metric data or not. The book provides a biocultural perception of population dynamics in Koch of Assam. The author discusses in details the on-going micro evolutionary trend in the Koch and deals with the stastical deviation of detribalized descendant Koch population from their ancestral tribal populations. The present volume is an extremely valuable addition to the subject of physical anthropology which intersects allied disciplines at several points.