Analysis of D. N. Uznadze's writings is proposed, mainly the early one
s related to the development of the so-called biospheric psychology. I
t was shown that D. N. Uznadze during all his life was adherent to the
biospherical version of the interpretation of the set. Repudiation of
this version was not determined with the logic of the concept develop
ment, it can be rather explained with the situation in scientific soci
ety Uznadze belonged to. On the basis of the quotations from his writi
ngs attributes of the primary set are extracted. It is proved, that th
e existing opinions on the primary set nature do not enfold its basic
attribute, namely, the function of mediating the relation between ment
al and trans-mental.