Fortunately, tucked away in the second section of Equality, among the pieces that Greene did not choose to incorporate into The Radical Deficiency Of The Existing Circulating Medium, And The Advantages Of A Mutual Currency (the 1857 version of Mutual Banking), or any of his subsequent writings, is a short essay entitled "COMMUNISM—CAPITALISM—SOCIALISM." It begins with a familiar paragraph from the essays on transcendentalism, with just a few changes:
The three partial philosophical systems which manifest themselves in every age of the world, have been defined as follows:—
"Transcendentalism is that form of Philosophy which sinks God and Nature in man. Let us explain. God,—man (the laborer)—and nature (capital)—in their relations (if indeed the absolute God may be said ever to be in relations) are the objects of all philosophy; but, in different theories, greater or less prominence is given to one or the other of these three, and thus systems are formed. Pantheism sinks man and nature in God; Materialism sinks God and man in the universe; Transcendentalism sinks God and nature in man. In other words, some, in philosophising, take their point of departure in God alone, and are inevitably conducted to Pantheism;—others take their point of departure in nature alone, and are led to Materialism; others start with man alone, and end in Transcendentalism."
And then proceeds with a section under the header:
Greene then provides the political equivalents of his three philosophical systems, damning them all pretty roundly, then ending with the affirmation that: "All these systems limit, modify and correct each other; and it is in their union and harmony that the truth is to be found." Here is the formula for Mutualism (according to Greene): (transcendentalism + materialism + pantheism) = (communism + capitalism + socialism) = Liberty, Equality, and Fraternity.
Everything that Greene wrote about individual components of his scheme, such as his scathing comments about socialism elsewhere in Equality, probably has to be read in the context of this need for "union and harmony." Certainly, the essays on transcendentalism must be read in that spirit.