The concept of Hilbert algebra was introduced in early 50-ties by L.Henkin
and T.Skolem for some investigations of implication in intuicionistic and
other non-classical logics. In 60-ties, these algebras were studied especially
by A.Horn and A.Diego from algebraic point of view. A.Diego proved (cf.
[4]) that Hilbert algebras form a variety which is locally finite. Hilbert algebras
were treated by D.Busneag (cf. [1], [2]) and Y.B.Jun (cf. [5]) and
some of their filters forming deductive systems were recognized. I.Chajda
and R.Halaˇs introduced in [3] the concept of ideal in Hilbert algebra and
described connections between such ideals and congruences. In this note we
describe connections between such ideals and deductive systems.