This periodical is edited by H. Ebbinghaus and A. König, with H. Aubert, S. Exner, H. v. Helmholtz, E. Hering, J. v. Kries, Th. Lipps, G. E. Müller, W. Preyer, and C. Stumpf as collaborators. It appears every two months. The review of the literature of its special department of research is very comprehensive. (Hamburg and Leipsic: L. Voss.) LA NUOVA FILOSOFIA. RAGIONI E IDEALI. By _La Direzione_. LA SENSAZIONE E LA SUA CONOSCIBILITA. By _R. Ardigo_. J. E. ALAUX'S LE PROBLEME RELIGIEUX AU XIX^e SIÈCLE. By _A. Torre_. ECONOMIA SCIENTIFICA ED ECONOMIA UTOPISTA. By _A. Loria_. P. LEROY-BEAULIEU'S L'ETAT MODERNE ET SES FONCTIONS. By _F. S. Nitti_. C. JANNET'S LE SOCIALISME D'ETAT ET LA REFORME SOCIALE. By _F. S. Nitti_. LOMBROSO'S AND LASCHI'S IL DELITTO POLITICO E LE RIVOLUZIONI. By _G. Fioretti_. CRITICA LETTERARIA. A. Angiulli—A. Saffi—F. Petruccelli della Gattina. (MEMORIE.) By _A. Torre_. LA POLITICA. QUESTIONI E PROBLEMI. La responsabilità filosofica, secondo _Paolo Janet_. This is the first number of _La Nuova Filosofia_ which is established, under the editorship of Dr. Andrea Torre, to diffuse in Europe and America the best results of contemporary culture, in relation especially to the life and development of society. (Naples: Dr. Andrea Torre, Vico Lungo Avvocata, 66.) APPENDIX. Cut exhibiting modifications that affect the accessory nucleus. Referred to on page 26 of this number of _The Monist_, in M. Binet's article "The Immortality of Infusoria." [Illustration: CONJUGATION OF CHILODON CUCULLULUS.] _A_, beginning of conjugation; _b_, mouth; _n_, nucleus; _nu_, nucleolus; _v. c._, multiple contracticle vesicles. _B_, division of the nucleolus into two segments, _nu'_, _nu'_; the nucleus _n_ begins to show signs of regression. _C_, each of the two individuals in conjugation contains two nucleolar segments, brought near together, of which one probably comes from the individual opposite by course of exchange, and will fuse with the segment not exchanged, to form a compound segment (Maupas). _D_, division of the segment into two portions which grow to unequal sizes; the larger, _nn_, will become the new nucleus, the smaller, the nucleolus of the new formation, _nun_. _E_, the old nucleus, _n_, reduced to a small pale and rumpled mass, is replaced by the new nucleus _nn_, near by which is seen the new nucleolus _nun_. VOL. I. JANUARY, 1891. NO. 2. THE MONIST. THE ARCHITECTURE OF THEORIES.