Cela had been reading like mad and taking notes, she used the methods of existing potions and cross-referenced ingredients that should do what she intended and came up with a potion and a plan. She read some of the extra notes that her brother had added by one of the more sensitive ingredients.
One leaf ingested will cause delirium. More than four leaves will cause the subject to fall into a deep and dreamless sleep, often resulting in death in less than 24 hours if further treatment is not sought. Generally the plant is used externally, but to harness the beneficial characteristics in a potion which is to be ingested without causing a toxic reaction, the plant may be burned and the smoke or the ash applied to the potion for a time.
Hmmm. She kept reading and made a few adjustments.
Of course, the process was just a plan, based on other potions and the notes in her book; Cela certainly wasn't sure of these things on her own.
She raised her hand, "Professor Kazimeriz, can you please check mine?"