Title: Description of a glass-apparatus for making in a few minutes, and at a very small expence, the best mineral waters ofPyrmont, Spa, Seltzer, Seyschutz, Aix-La Chapelle, &c. Together with the description of two new eudiometers, or instruments, for ascertaining the wholesomeness of respirable air, and the method of using these instruments, in a letter to the Rev. Dr. J. Priestley