This entire book is available online in a variety of formats at archive.org. See also Word document.
Author note: "Rev. Henry H. Jessup, D.D, of Beirout, Syria."
Documents posted between 2003-2012 had various slightly different URLs and sometimes can be found in archive.org with addresses like bahai-library.com/file.php5?file=jessup_neelys_history_religions.