Could Botany and Pharmacy have been one department?

[ololololo]

i think the owner probably died, and the person acting as his executor took care of his belongings, but did not understand the writings, they just bound it up in the best order they could. (luckily they did so that it survived the passage of time so that we could see it) they probably thought it had value, even though they may not have been able to read it.

Yes, that's true, but that's not the point.
Logically, Pharmacy should indeed be near Botany. This is consistent with the fact that Pharmacy has a trace of Scribe A, who worked on Botany.