Jenae: Gollnerianis [ Gollner ] 1688. First Edition.  pages + folding portrait of Weigelius in 1688 at age 63. 6 x 7 3/5 inches. Old acidic wrappers affixed at spine to 2 leaves and portrait. Browned throughout but not brittle. Text in Latin and German. Good. Pamphlet. 
Erhard Weigel was a German mathematician, astronomer and philosopher who was appointed Imperial advisor in the year this short treatise was published (wikipedia). Scarce, with only 3 copies in Worldcat as of this writing, all in German institutions, and it is unclear if they include the portrait. Possibly an address talking up education for the Feast of the Trinity, it notes in part (poorly translated from Latin online): "And so, when large numbers of men to me the letter of the prodigies and flow together here and there, who Instructors of so capable they desire, as when in private letters, and so more often or public, to cleanse their in fact, exactly the conditions of propositions, and that we who have a salary or at least one, and the common people have thus far had been done, the authors of promise, if only on Arithmetic, Geometry, Astronomy, Music, at least he is going. are to be practiced, in order to instruct youth the rudiments of that was profitable unto such of the sciences of their tender age they are able to; are satisfied, they COLLEGE private, such that to say that it is lawful for Liberal Arts (for example, the four of them, I have named as real) LOVE LEARNING to the assistance to instruct, as well as to inform others, if ye have need of, is informed by the other hand, the success of hm were placed, also the manner of the Greeks and of himself more highly that they themselves, and earlier in the year, let them learn."