  We obtain estimations for isotopy classes of embeddings of closed k-connected
n-manifolds into R^{2n-k-1} for n>2k+5 and k\ge0. This is done in terms of an
exact sequence involving the Whitney invariants and an explicitly constructed
action of H_{k+1}(N;Z_2) on the set of embeddings. (For k\ne1 classification
results were obtained by algebraic methods without direct construction of
embeddings or homology invariants.)
  The proof involves reduction to classification of embeddings of punctured
manifold and uses parametric connected sum of embeddings.
