E RHEI AQUOS probably used for an electuary or an essence of medicated water obtained by the distillation of Rhubarb.
MASS: PIL: RUFF: probably for a special pill mass of which anti-pestilential pills were rolled. These were named after the anatomist and physician Rufus of Ephesus, who lived in the first century A.D.
See D.A. Wittop Koning, Apothekerspotten uit de Nederlanden,
Haarlem, 1991, p. 70, ill. 112 for similar examples.