Augustus de Morgan 
Life and Work of Newton [PDF ebook] 

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. To this second essay I have added an appendix, the chief aim of which is to give the sources at which the original manuscripts written by Newton and Leibniz when they were discovering their respective calculuses may be found. This has not been done hitherto, and it is all the more necessary that it should be done, as modern authors, such as Moritz Cantor in his monumental Vorlesungen zcher Ge schichte a’er Mathemati/e, neglect the fact that any early manuscripts Of Newton’s on fluxions are extant.