Monas Hieroglyphica f1r MS-408 Key FOUND!!!

[-JKP-]

...
Here is what the Latin line is:

per lineam rectam circulumque, prima simplicissimaque (space) fuit rerum, tum, non existentiu(m), tum ...

(For comparison here is your line):

per lineam rectum circulumque, prima sim- pliciffimaquefuit rerum, tum, non exiften-

My Latin is rudimentary (so Latin scholars DO correct anything I got wrong) but I'm agreement with Thomas on most points.

Here's what I get as a transcription:

Per Lineam rectam, Circulum[ ]que, Prima, Simplicissi[ ]maque fuit Rerum, tum, non existentiu[m], tum in Naturae latentium Involucris, in Lucem Productio, representatio[ ]que.