found at Kalibangan. At Lothal, in one case, the pit was lined with
  mudbricks, which suggests that shrouds or coffins were probably in vogue.
  At Harappa traces of a wooden coffin and bodies covered by a reed-shroud
  were found. From Surkotada comes the evidence of the practice of pot-
  burial. From the Lothal cemetery comes evidence of another burial type
  with several examples of pairs of skeletons, one male and one female in
  each case, interred in a single grave. Though these may not necessarily
  indicate the practice of sati, they do suggest some sort of ceremonial
  burial of the wife or servant or dependents after the husband or the master.
Weights and Measures
Harappans used weights and measures for commercial as well as building
purposes. Numerous articles used as weights have been discovered. The
weights proceeded in a series, first doubling, from 1, 2, 4, 8 to 64, etc. and
then in decimal multiples of 16.
    Several sticks inscribed with measure marks (one such is made of bronze)
have been discovered. Harappans were the authors of a linear system of
measurement with a unit equal to one angula of the Arthasastra which was
used in India till recently. The measures of length were based upon a foot of
37.6 cm and a cubit of from 51.8 to 53.6 cm.
Theories of Decline
Environmental Factors Several Harappan sites are around the now dried-
up Ghaggar-Hakra river, which flows south of the Indus and parallel to it.
Most of the scholars, as already seen in origins, now feel that the Ghaggar-
Hakra was a mighty river during Harappan times, and may have been the
mythic Sarasvati river that the Rigveda and other sources talked about.
According to this theory, earthquakes in the Himalayas which are fold-
mountains may have resulted in a shift in the Ghaggar-Hakra river,
destroying cities in the process.    Subsequent flooding and drying up of the