Experiments and Observations on the Following Subjects: 1. On the preparation, calcination, and medicinal uses of Magnesia Alba. 2. On the solvent qualities of calcined Magnesia. 3. On the variety in the solvent powers of quick-lime, when used in different quantities. 4. On various absorbents, as promoting or retarding putrefaction. 5. On the comparative antiseptic powers of vegetable infusions prepared with lime, &c. 6. On the sweetening properties of fixed air.

"Experiments and Observations on the Following Subjects" by Thomas Henry is a scientific publication written in the late 18th century. The work focuses on pharmacological inquiries and the preparation of medicinal substances, particularly magnesia alba. It presents a series of experiments and observations that aim to improve understanding and methodology in chemical pharmacy. At the start of the treatise, the author dedicates his work to Thomas Percival, expressing gratitude for his influence on his experimental pursuits. The preface highlights the importance of precise composition in medicine and suggests that apothecaries should take an active role in furthering chemical knowledge. The opening chapters detail an improved method for preparing magnesia alba, discussing its medicinal properties, and methods of preparation while criticizing the existing practices in the field. Henry emphasizes the need for purity in medicinal substances and outlines how various factors influence the effectiveness of drugs prepared from magnesia.