What sort of “elixir” does Mrs. Joe give Pip? Why?

Tar water was once believed to be beneficial for many ailments, as well as for making hungry stomachs feel full. Mrs. Joe used the elixir for both her husband and brother, obviously believing like most people at the time that it was a miracle drug.

Some medical beast had revived Tar-water in those days as a fine medicine, and Mrs. Joe always kept a supply of it in the cupboard; having a belief in its virtues correspondent to its nastiness. At the best of times, so much of this elixir was administered to me as a choice restorative, that I was conscious of going about, smelling like a new fence. On this particular evening the urgency of my case demanded a pint of this mixture, which was poured down my throat, for my greater comfort, while Mrs. Joe held my head under her arm, as a boot would be held in a bootjack. Joe got off with half a pint; but was made to swallow that (much to his disturbance, as he sat slowly munching and meditating before the fire), “because he had had a turn.” Judging from myself, I should say he certainly had a turn afterwards, if he had had none before.

Thank you so much!