My head hurts.

So, I've been going over the Longobardus and Invocation of Angels texts, mainly in preparation for the next updated release of the latter, and decided to run a more detailed comparison of the Sloane 3821 text of "A Select Treatise" with the fragment in Sloane 3825.  So here's the thing:

* The opening of the conjuration of Agiel in 3825 (fol. 99r, v) is with one or two exceptions (e.g. it has "art" for "are" at one point) word for word (i.e., differing on spelling, capitalisation and punctuation) identical to that in 3821.

* The fragment in 3824 (fol. 37r), which was part of the above (handwriting is the same and the page numbering and text continues directly from where the 3825 copy breaks off) until Ashmole detached the sheet on which it was written from the rest of that book and appended it to his "Longobardus" notebook, deviates significantly from the 3821 text before trailing off.

3824: "[…] same to transmit your true & reall presence, Corporally, in your Appearances plainly & Visibly, to the Sight of our Eyes, & Voyces to our Ears, that We may also as plainly & Visible see you & Audibly here you, speake unto us: or otherwise to Appear out of the same Visibly here before us, as it shall please God & you his Servants, or Servants as Messagers of his paterniall grace, & mercy, Seemeth Most Meet, proper, pertinent, or best befitting this action, Appearance, Occasion or Matters &c."

3821: "[…] same to transmit youre true and reale preasance In splended Appearance plainely unto the sight of our Eyes uter your voyces unto our Eares that we may not only visible see you but audibly heare you speake unto us and that we may Convers with you or otherwise forthwith Appeare out of them visibly upon this Table or ffairely upon the flore and shew plainely & visibly unto us A Suffitient signe or teste of youre Coming and Appearance" [&c. &c. &c.]

This almost suggests that the introduction, description of Agiel and the opening of the conjuration was written by one writer: that either the original writer left it unfinished, or whoever was copying it after the 3825 Janua gave up a short way into the conjuration of Agiel, and that the work was subsequently completed by someone else based on that copy after Ashmole detached one sheet.