  The both mass-dependent and field shift components of the isotopic shifts and
the lowest order QED corrections for the ground (singlet) $1^1S(L = 0)-$states
of the ${}^{3}$He and ${}^{4}$He atoms are determined to high accuracy. For the
same states we also evaluated the lowest-order QED corrections and the
corresponding recoil (or finite mass) corrections. In our calculations we have
used the new (corrected) formula for the recoil correction to the lowest-order
QED correction which can be applied to atoms/ions with arbitrary nuclear charge
$Q \ge 1$.
