Today I marked up Charles de L'Ecluse, and searched through latin Thuanus texts for a more pertinant letter. - it is found in his notes added on:
http://babel.hathitrust.org/cgi/pt?id=ucm.5325326485;view=image;q1=ecluse;start=1;size=100;page=root;seq=331;num=317. To be transcribed and marked up.
found text with letter from mettelus to cassandre. Transcribe? Compare to letter published in Niceron. Mark up Niceron according to translation in O'Malley.
Also, searched bayle's dictionnaire historique et critique...