This paper was an attempt to submit to a severe and searching examination, the very new and apparently important ideas contained in the work, published four years ago by Mr John Taylor of London, and entitled “The Great Pyramid; why was it Built?” To this end, the original authorities for measures of the Pyramid, had been extensively referred to, from Professor John Greaves in the 17th century, down to Colonel Howard Vyse and Dr Lepsius in the 19th; and their various and sometimes conflicting numerical statements had been computed with all due attention to scientific accuracy, as well as every endeavour to eliminate both personal and other sources of error in tbe observations.