One of the principal objects of the author’s journey was to see M. Gabriel Tarde, “one of the most prolific and original publicists in France, if not in Europe,” who resides at Sarlat. After quoting passages from an article of M. Tarde on Social Darwinism, which appeared in the _Revue Philosophique_, M. Delbœuf remarks that nothing is more attractive and at the same time more fatiguing than the reading of his works. M. Tarde is “the locomotive that carries you to the end of your journey across countries by turns wild, agricultural, industrial, picturesque; but without giving you time to regard and admire.” Referring to M. Tarde’s acute criticisms of Lombroso and his theories, the author says, “It is not that he strikes the pseudo-thinker with formidable blows, but he makes him drop gently to the ground.” The French publicist sees in _imitation_ the source of social life, and he has been long engaged in developing the idea, to the great importance of which M. Delbœuf bears witness; although he objects to the use which M. Tarde makes of terms taken from mathematics, physics, and biology, to express his sociological views. On the question of free-will there was no agreement. Although the latter is a determinist, he believes in penal responsibility, on the ground of personal identity; the diseased person or the madman is no longer himself, in which they differ from the criminal. We can say nothing of M. Delbœuf’s visit to the canons of the Tarn. Here was captured a lizard which displayed, when compared with a Spanish lizard in captivity with it, as much difference in character as could be found between two men chosen at hazard. The author concludes an amusing description of the habits of the two captives by recommending their history to the politicians and the historians of France and Spain, as likely to throw light on that of the peoples themselves. We leave M. Delbœuf, whose book of seventy-five pages may be said to be as full of interesting matter as an egg is of meat, with quoting his postscript: “On the day that these lines appear (March 1891) the Spanish lizard has finally cast off his savage character and follows in the footsteps of the French. Effect of imitation.” Ω. DER POSITIVISMUS VOM TODE AUGUST COMTE’S BIS AUF UNSERE TAGE (1857-1891). By _Hermann Gruber_, S. J. Freiburg im Breisgau: Herder’sche Verlagshandlung. 1891.