Can we make isoglosses?

[MarcoP]

There is an occurrence of "geißmich" (no L) at the bottom of You are not allowed to view links. Register or Login to view.. If I understand correctly, the main paragraph is a recipe for "an oil to make hair of a golden color". The same paragraph has "Frawenmilch" at line 3 and at p.155 it has "geißmilch" (with an L). So "geißmich" looks like a typo and I doubt it is a meaningful parallel for a word in a manuscript.

   

About isoglosses (new word for me), German philology should probably be the place to start. There must be secondary sources where the subject is discussed: these sources may not mention "pox" or "mich as milch" specifically, but if these are regional variants they must fall within larger phenomena that have certainly been studied. Of course, a pre-requisite to access studies in the field is a good knowledge of German: I certainly don't qualify 

The fact that Salomon and Panofsky (German academics who devoted their professional life to the study of ancient artefacts and manuscripts) found the idea plausible sounds significant, but confirmation in philological studies would make it easier to build more consensus.

EDIT: You are not allowed to view links. Register or Login to view. (1613) corrects "geißmich" and makes clear that the preceding word was meant to be "nim"...