Note: With this post I begin to present the material about William Barlow's Summe andSubstance from my thesis in what I hope is a more readable form. Sections will be posted as they are completed. After the elementary questions about the publication what I believe would be most useful is an annotated edition of Barlow's work, but I am not sure how practical that would be for posting on a blog. Either in that way or some other, the main point of this introduction will be to address the questio...