What caused latin to be phased out in secular book printing?
The wikipedia article on Neo-Latin says ‘there was no sharp cutoff, but rather a slow diminuendo occupying the greater part of the 18th and 19th centuries.’‘Although Latin was supreme as an international language in the 17th century, in the early decades of the 18th century its place as a language of international diplomacy came to be taken by French, due to the commanding presence in Europe of the France of Louis XIV. At the same time, some (like King Frederick William I of Prussia) were dismissing Latin as a useless accomplishment, unfit for a man of practical affairs. As the 18th century progressed, the extensive literature in Latin being produced at the beginning slowly contracted, until by 1800 it was only a trickle.’Even in the early 17thC there were many books issued in both Latin and in their authors’ vernaculars… Here‘s an essay on The Decline and Fall
