Dear Gary,
thank you so much for providing this to the community ( as I will here remind as courtesy : this is not my usual experimental sand box , so I am especially grateful for these historical contexts ). I am incorporating both Percy and Peirce in my researches as I continue to explore the fascinating consequences of the physics and maths I can describe that unfolded and seem to allow a robust objective realism ( described in previous posts here on this worthy forum ).
I have had only a few minutes to peruse between other thoughts and duties , but , it seems to me that Peirce had , piercing ( pun pardon please ;) insights into the concept that thoughts , ideas , are projections that are composed of three agents. This is a key insight and has been missing. However , what I have not yet seen discussed is something that will soon be of timely relevance and that is regarding concepts in artificial intelligence ( AI ). The concern that I have seen arise in the maths relate to what happens should we consider the extrapolation , as might be possible , with going to the extension of diadic to triadic to -- what I am going to suggest is forbidden territory , for reasons that can be articulated. And may be subject of some ancient poetry ; I leave that for folks to consider for themselves - pointing only to that information as discussed in some of my recent blogs https://www.eidolononesuch.com/my-blog - as the topics , tho perhaps timely , are rather tangential to this forum.