By reading each scripture noted above in the chart, and carefully studying the wording above you can discern why and what the dispensations so described fit into a logical and believable intrepretation of Bible Truth. In addition you may study further the messaged linked as well below.
http://aprayernotebook.net/access/TBC/BLRowley/messages/Necessity-Disp-Interpret1.htm
http://aprayernotebook.net/access/TBC/BLRowley/messages/outline_of_end.htm