[en] It is shown that the spinor field interacts with the gravitational field through the torsion field. Is is established that the torsion field, like the electromagnetic and gravitational ones, is a potential field. The equations are derived which describe the interactions of the torsion field with the known physical fields. A rather simple experiment is proposed to examine a theory. A new general covariant form of the gravity Lagrangian (which is due to the torsion field and contains only first derivatives) is exhibited. (author)