I am researching a humanist text, Johannes Matthaeus Phrissemius' preface to his edition of Rudolf Agricola's De inventione dialectica. In it, he contrasts the (in his opinion) useful topics contained in Agricola's work with the (again, in his opinion) abstruse and useless questions being debated in standard university textbooks of dialectic.
He complains about the person falsely termed a dialectician [dialecticus], "qui aliud nihil, qua[m] in umbra nugatur disputatq[ue] cotidie, ecquid tantum septem sint artes mechanicae, ecquid adiectiua appellent, ecquid terminus in propositione positus, possit supponere personaliter.”
And, while we're here, is "in umbra" an idiom? It occurs in a parallel passage describing the activity of the "true" dialectician:
"At dialectico, hoc est ei, qui probabili accurataq[ue] de re quauis uti uelit oratio[n]e, & in umbra ac schola discere ea,"
