Charles Piazzi Smyth (1819-1900), Astronomer Royal for Scotland and Regius Professor of Astronomy at Edinburgh University, was highly respected for his practical work on astronomy. His book Teneriffe, an Astronomer's Experiment from 1858 is considered a classic. His interest in 'pyramidology', which is detailed in Our Inheritance in the Great Pyramid (1864), has damaged his reputation in scientific circles, but the fact remains that he did detailed, in depth measurements of the Great Pyramid with the most advanced instruments of his day, the first time that the structure had been so thoroughly studied. From the information gathered he theorized that the Pyramid was built using a standardized measure, the "Pyramid Inch', and that the Pyramids had been built by the descendents of Noah using this system of measurement that had been handed down from the time of Adam in the Garden of Eden. Although many may disagree with his interpretation of the data gathered, no one can fault his methodology and the accuracy of his measurements. In this, the 1874 edition of this book, you can see what he discovered in his exploration of Giza and decide for yourself the validity of his conclusions.