I think it's a Princess Bride reference.
The mushroom does nothing to the rat, therefore its effects must be beneficial or something.
I honestly think the 2 leaves/1 Blue Root combo should be sold as more of a genetic health potion, since the actual cure for ulcers is antacid. Unless that Blue Root is naturally rich in sodium bicarbonate, in which case nevermind.
As for action, go and buy a nifty sign to hang outside
Bah! Your science has no place here!
You check the tome for an addictive substance. You find Devil Berries, a powerfully addictive local anesthetic.
You gather herbs the rest of the day looking specifically for Devil Berries and Colour Leaves. You gather four of each and 1 bundle of sweet leaves.
Your assistant goes into town and sells the two antacid potions for 50gp and buys a sign with the money. He returns and works on your garden planting blue root. He then gathers 3 bundles of herbs. Those being 2 Long Weed and 1 Crying Tree Bark.
Attractiveness:
(||||||||||||||||||||||||||||||||||||||||||||||||||)Credibility:
(||||||||||||||||||||||||||||||||||||||||||||||||||)Fame:
(||||||||||||||||||||||||||||||||||||||||||||||||||)Money:
89gp
Herbs:
7 bundles of Colour Leaf1 bundles Sweet Leaf4 bundles Death Leaf7 bundles Mad Hatter0 bundles Red Cheese Mold6 bundles Blue Root1 bundles Crying Tree bark6 bundles Long Weed3 bundles unidentified mushroom.4 bundles Devil BerriesPotions:
17 empty vials
0 Antacid0 Mad Death1 rainbow, odourlessAssistants:
1 human
2 rats
Shop:
simple hut
Garden:
5 - Blue Root