Décadent poets, 230 _et seq._ Descartes, 22 Dickens, 23 Diderot, 34 Discoveries, dates of, 105 _et seq._ Disease on genius, influence of, 151 Domenichino, 17 Donizetti, 9, 11, 62 Dostoïeffsky, 8, 321, 339-341 Double personality of men of genius, 24 Dreams, genius working during, 21, 326 Dumas _père_, 7, 62 Dupuytren, 41 Education on genius, influence of, 159-160 Egoism of men of genius, 318-319 Enfantin, Prosper, 295-296 Epilepsy and genius, 38 Epileptoid nature of genius, 336 _et seq._ Erasmus, 6, 8, 13 Flaxman, 7 Flaubert, 7, 14, 17, 28, 40, 50, 60, 331, 341 Florentine genius, 123, 154-155 Foderà, 91 _Folie du doute_ of men of genius, 48 _et seq._ Fontenelle, 62 Forgetfulness of men of genius, 33 Foscolo, 9, 11, 18, 20, 29, 31, 104, 106 Francis of Assisi, 258-260 Frederick II., 62 French genius, 127 Galvani, 109-110, 114 Gambetta, 11, 12 Gauss, 12 Genius, Aristotle on, 1; Plato on, 2; Diderot on, 3; Richter on, 19 Genius, a neurosis, 5; distinct from talent, 19, 35; in the insane, 161 _et seq._; in mattoids, 226 _et seq._; its epileptoid nature, 336 _et seq._; in the sane, 353 _et seq._ Genius, characteristics of men of, 6; height, 6; frequency of rickets, 7; pallor, 7; emaciation, 7; cranial and cerebral characteristics, 8-13, 327; stammering, 13; lefthandedness, 13; sterility, 13; unlikeness to parents, 14; physiognomy, 14; precocity, 15, 315; delayed development, 16; misoneism, 17; vagabondage, 18, 316; unconsciousness and instinctiveness, 19; somnambulism, 21; inspiration, 22; double personality, 24; stupidity, 25; hyperæsthesia, 26; anæsthesia, 33; forgetfulness, 33; originality, 35, 317-318; fondness for special words, 37; frequency of chorea and epilepsy, 38; melancholy, 40; delusions of grandeur, 45; _folie du doute_, 48 _et seq._; alcoholism, 54, 316; hallucinations, 56; moral insanity, 57; longevity, 64; insanity, 66 _et seq._; meteorological influences on, 100 _et seq._; climatic influences on, 117 _et seq._; influence of race, 126, 133; influence of sex, 137; influence of heredity, 139 _et seq._; relation to criminality, 144 _et seq._; age of parents, 149; conception, 149; influence of disease on, 151; influence of civilization on, 153 _et seq._; influence of education, 159-160; characteristics of insane, 314 _et seq._; analogy of sane and insane, 330 _et seq._; in revolutions, 334-335 Giordani, 104 Giusti, 40, 104 Goethe, 7, 15, 21, 40 Gogol, 98-99 Goldsmith, 6 Goncourts, the, 28, 331, 339, 342 Grandeur among men of genius, delusions of, 45 Graphomaniacs, 212 _et seq._ Gray, 43 Guiteau, 313 Haller, 67, 319, 320 Hallucinations of men of genius, 56-57 Hamilton, Sir W. R., 109 Hamlet, 53 Haydn, 19 Head injuries and genius, 8, 151 Heat on genius, influence of, 103 _et seq._ Height of men of genius, 6 Heine, 6, 103, 152 Hoffmann, E. T. A., 90-91 Hogarth, 6