Both of these bottles are metaphors for alchemy substances. On the right is a three-headed eagle, representing mercury. In the left bottle, a three-headed monster that represents salt, sulfur, and mercury.

Source: “A three headed eagle…” (1909) by Edith A. Ibbs – Wellcome Collection, public CC BY 4.0. “A three headed monster…” (1909) by Edith A. Ibbs – Wellcome Collection, public domain.