On weak and special deformations of webs

In three-dimensional projective space {bf P}^3, the author considers a 3-web W formed by three families of space curves. He studies the problem of deformation of two webs Wsubset{bf P}^3 and overline{W}subsetoverline{bf P}{}^3 in connection with the problem of deformation of point correspondences between {bf P}^3 and overline{bf P}{}^3.