Let's rate some bulls

[oshfdk]

I think it's mystery solved: the whole manuscript is about ophthalmology, specifically plants and baths to help grow extra eyes. EVA d represents lenses, and the gallows are various frames for as many eyes as one desires. Benched gallows are the normal glasses and ordinary gallows are pince-nez and lorgnette variants. Note that there are many sunglasses in the manuscript as well.