Idealist logic has fallen out of fashion, though perhaps with little excuse. More or less "analytic" philosophers become exercised every now and then over the ontological status of propositions; perhaps they should remind themselves of an earlier tradition that began instead with the _judgment_ and never allowed the divorce between mind and reality which seemed to confer independent existence on the wraithlike entities with which propositional logic deals.
For Bosanquet, as for the Idealists generally, there is not "knowledge" over here, on the one hand, and the reality it is "about" over there, on the other. As he puts it later (in _Implication and Linear Inference_), knowledge just _is_ reality itself _qua_ known, and that same reality is in some manner "constituting and maintaining itself in the form of truth" in the very process of becoming and being known.
The knowledge of which logic is the reflective analysis, as H.H. Joachim develops this view in _Logical Studies_, is not something "in" the mind, on the one hand, and opposed to the reality it is "about," on the other; there is just "knowledge-or-truth" in some process of self-fulfillment or self-development, which simply _is_ reality manifesting itself; reality may be more than this self-development, but it is not less. And it is _this_ logic -- not abstract formal logic but the logic of reality's own "self-development" -- which Bosanquet discusses at length in this classic work.
Undoubtedly this way of putting things will sound strange to modern readers, at least those who have not steeped themselves in the Idealist tradition. But in its way this approach to logic seems strangely and naively correct; is there really a difference between reality "in itself" and reality "as we understand it"? Granted that the latter is always incomplete, but is it really of a different _character_ from reality altogether? If so, how do we come to "know" anything at all?
At the very least, Idealist logic deserves a second look in view of the paradoxes to which formal "propositional" logic leads. And there is no better place to start than this great work, now all but forgotten.
Warning: Bosanquet is not the clearest writer ever born. It will be helpful to have a copy of -- say -- H.H. Joachim's aforementioned _Logical Studies_ at hand in order to work out what in the world Bosanquet is talking about.
Another helpful source is Brand Blanshard's _The Nature of Thought_, which in many respects advances the Idealist argument into genuinely new territory. Blanshard later modified (indeed, all but abandoned) his view that an idea just _is_ its object _in posse_ and would, if developed, simply become identical with its object. But whether he should have abandoned that view or not (I personally suspect not), his development of it in _The Nature of Thought_ will be helpful to the reader who wants to get a handle on Bosanquet.
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