Like many other distinguished German jurists, pari passu with his professorial activity, Simson followed the judicial branch of the legal profession, and, passing rapidly through the subordinate stages of auscultator and assessor, became adviser (Rath) to the Landgericht in 1846.
As these jurists had in their commentaries upon the leges, senatus consulta and edicts of the magistrates practically incorporated all that was of importance in those documents, the books of the jurists may substantially be taken as including (i.) and (ii.).
Tribonian has been blamed for the insertions the compilers made in the sentences of the old jurists (the so-called Emblemata Triboniani); but it was a part of Justinian's plan that such insertions should be made, so as to adapt those sentences to the law as settled in the emperor's time.
The number of jurists from whose works extracts were made is thirty-nine, but the writings of Ulpian and Paulus make up quite half the work..
The work was declared to be the sole source of nonstatute law: commentaries on the compilation were forbidden, or even the citing of the original works of the jurists for the explaining of ambiguities in the text.