Richard Davies M.D. I have lastly to this collection of experiments added some of my own, which I endeavoured to make with as much accuracy as the instruments I was provided with would allow of. My hydrostatical balance was one constructed several years since by Mr. Francis Hauksbee, which I have constantly found to turn sensibly with half a grain: and the bodies on which I made most of my trials, were taken from a collection of the materia medica formerly made by Signor Vigani, and still preserved in the library of Queen's College in Cambridge. |