Comment by ppint.:
first of two novelettes published as stand-alone (though obviously linked) stories in
astounding science fiction, later collected and published in h/cvr by victor gollancz as the fix-up (possibly no revision of either to fit together, i've not checked; so may be a ''non-fix-up'') novel, "
orphans of the sky" (1963),
q.v.
''universe'' (novelette) astounding vol. xxvii #3, 5/1941
the cover story, with five b+w interior illustrations also by hubert rogers
''common sense'' (novelette) astounding vol. xxviii #2, 10/1941
five b+w interior illustrations by paul orban