I. A. M. Guerry 30 II. Ad. Quetelet 31 III. Edw. Ducpetiaux 33 IV. L. M. Moreau-Christophe 37 V. G. Mayr 38 VI. A. Corne 47 VII. H. Von Valentini 50 VIII. A. Von Oettingen 53 IX. H. Stursberg 55 X. L. Fuld 57 XI. B. Weisz 60 XII. W. Starke 62 XIII. Rettich 66 XIV. A. Meyer 68 XV. M. Tugan-Baranowsky 71 XVI. E. Tarnowsky 73 XVII. H. Müller 74 XVIII. Criticism 84 CHAPTER III THE ITALIAN SCHOOL I. C. Lombroso 88 II. R. Garofalo 96 III. E. Ferri 99 IV. H. Kurella 136 V. E. Fornasari di Verce 138 VI. A. Niceforo 145 CHAPTER IV THE FRENCH SCHOOL (THE SCHOOL OF THE ENVIRONMENT) I. A. Lacassagne 148 II. G. Tarde 149 III. A. Corre 161 IV. L. Manouvrier 164 V. A. Baer 176 CHAPTER V THE BIO-SOCIALISTS I. Ad. Prins 178 II. W. D. Morrison 181 III. F. Von Liszt 187 IV. P. Näcke 190 V. Havelock Ellis 192 VI. Carroll D. Wright 193 CHAPTER VI THE SPIRITUALISTS I. H. Joly 199 II. L. Proal 203 III. M. de Baets 205 IV. Criticism 207 CHAPTER VII