In this final essay on the philosophy of Proudhon, M. Sorel considers the theory of justice by the light of the notion of free will. He differs somewhat from Proudhon, and affirms that “the just man is the upright man such as our ideal conception of antiquity represents him to us, but transformed by our consciousness as refined by the influence of Christianity.” In dealing with the real organisation of societies it is necessary to distinguish between matters of justice and those of right, which includes that of force, of which war is an application. After showing the connection of the economic _contradictions_ of Proudhon with the state of war, and the value of education for the realisation of equilibrium in the state. M. Sorel affirms that education ought to be based on manual labor, for the explanation of which science should be taught; and that instruction should endure throughout life, so that men can elevate themselves and that an equilibrium may be obtained between knowledge and industrial needs. (Paris: Félix Alcan.) Ω. APPENDIX. PLATES BELONGING TO THE ARTICLE “THE NERVOUS GANGLIA OF INSECTS.” KEY TO THE PLATES. col. ven.—ventral column. lob. dors.—dorsal lobe. lob. ven.—ventral lobe. lob. v. inf.—inferior or lower ventral lobule. lob. cr.—crural lobule. con. dors. sup—superior (or upper) dorsal connective filaments. con. dors. moy.—medial dorsal connective filaments. con. dors. inf.—inferior (or lower) dorsal connective filaments. con. v.—ventral connective filaments. n. cr.—crural nerve. n. al.—alary nerve. lob. al.—alary lobule. rac. sup—upper (or superior) root. rac. moy.—medial root. rac. inf.—lower (or inferior) root. fa. as.—ascending fasciculus. [Illustration: PLATE I. _Rhizotrogus solstitialis._ First thoracic ganglion. (Horizontal sections.)] [Illustration: PLATE II. _Rhizotrogus solstitialis._ First thoracic ganglion. (Horizontal sections.)] [Illustration: PLATE III. _Rhizotrogus solstitialis._ First thoracic ganglion. (Longitudinal sections.)] [Illustration: PLATE IV. _Rhizotrogus solstitialis._ First thoracic ganglion. (Transversal sections.)] VOL. III. JANUARY, 1893. NO. 2. THE MONIST. THE DOCTRINE OF AUTA.