We ought thank Miss Granger, then; it was a question of hers, when I was expounding upon the various notations potioneers have used throughout the centuries, that made me think of it.

Mind you, I am still not certain that is the answer: if it is, it will be yet another way in which this potion is exceptionally strange, as I can think of very few other potions using that preparation, which is why I interpreted the notation as drams rather than fluid drams. It is, however, worth a try.

Do not short your child time; this project is by no means urgent.