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 book from the 1700s that explores the world of chemical pharmacy and medicinal chemistry. The writing is a collection of experiments and findings designed to advance the understanding of preparing medicine, particularly magnesia alba, which is a compound with medical uses. The author starts by thanking Thomas Percival for guidance in his research. The preface stresses how important it is for medicines to be made precisely, urging pharmacists to learn more chemistry. The book then gets into how to make magnesia alba better, going over its medical uses and production methods, while also pointing out problems with the common approaches at the time. The aim of the book is to highlight how important it is for medicines to be pure and going over how different things can change how well magnesia-based drugs work.