http://en.wikipedia.org/wiki/Graphology That's graphology.
The point of the test would be to prove that the effect of having dreams about mushrooms has nothing to do with the use of mugroot, rather because the brain has created an association between the two. The test would only work on you though, as you are the one that has dreams about mushrooms when sleeping with mugroot under your pillow. Now, if many people have mushroom-related dreams while using it, then that's a different story, and you'd need a different test, like testing with someone who had never heard of mugroot and had heard no stories about musrhroom-related dreams, to make sure it's not a placebo effect since they heard that other people have those sorts of dreams.
Quote:
Coriander doesn't make me dream about mushrooms.
Exactly. Just like for me, playing no other game makes me recall nachos, because only that one game is associated with it. (This example is kind of silly, sorry I couldn't come up with a better one; that's the first that came to mind

)
There's no doubt that plants like cannabis, coca, the opium poppy, peyote, coffee, and others cause chemical changes to the brain, but that is very different from "alternative medicine", like herbology, homeopathy, and so on, which are based on folk tales and word of mouth rather than trials, observations, and proof of their effectiveness.