Addenda to the Aedes Hartwellianae is a book written by William Henry Smyth in 1864. The book serves as a supplement to Aedes Hartwellianae, which was published in 1850 and is a catalog of the astronomical instruments and observatory of Sir William Hartwell. The addenda includes additional information and updates to the original catalog, as well as corrections and clarifications. It also includes Smyth's own observations and discoveries in astronomy, as well as his thoughts on the instruments and techniques used in the field. The book is a valuable resource for astronomers, historians of science, and anyone interested in the history of astronomy and scientific instrumentation.This Book Is In English.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.