Paul, thanks. Your description was just fine. It indeed sounds like Brown's manuscript may have been lecture notes, but not lecture notes. Clay
The preface to The Card Magic of E.G. Brown seems to support your premise, Clay. It mentions Brown's "reluctance to publish the secrets of his actual tricks was matched by his willingness to devote countless hours to the preparation and delivery of regular, immensely valuable lectures the The Magic Circle on the art, theory and technique of conjuring..." The preface does say, though, that Brown was looking forward to retirement and "the opportunity to write his own book on the subject he loved so well, and thus record all his work in a single, permanent, printed form."
The Brown lectures were printed in The Magic Circular in serial form. In addition, in the preface Hall states that "the one lecture that was never printed because of paper shortage, and might therefore have been lost forever, can be reconstructed thanks to the author's gift to me of his handwritten notes. It is Edward's invaluable dissertation on 'Forcing'."
While not conclusive, the comments do send me toward the direction that they were personal notes, and regardless of completeness, not intended for distribution or sale.