I refer those who wish to form an idea of the development reached by Broca’s centre in some of the brains of the Munich collection to Rüdinger’s monograph, and to the beautiful plates which accompany it. One remarks especially the enormous size and the numerous superficial folds at the foot of the left convolution in the jurist Wülfert, who was remarkable among other qualities for his great oratorical talent. On the other hand, the convolution is much reduced and very simple on the left, much developed in all its parts on the right, in the brain of the pathologist Buhl, a professor whose speech was clear and facile, but who was left-handed, or at all events ambidextrous. To these facts others may be added, showing the morphological complexity of Broca’s convolution in distinguished men; in the brains, for instance, of various men of science, described and figured by R. Wagner.[34] Among these was the illustrious geometrician, Gauss: compared with Gauss’s brain that of an artisan called [Illustration: Fig. 1. Gauss’s Brain. “ 2. Frontal Lobe of same. “ 3. Brain of a German Workman. Fig. 4. Frontal Lobe of same. “ 5. Dirichlet’s Brain. “ 6. Hermann’s Brain.] Krebs was much less complicated, and notably narrower in the frontal region. The frontal convolutions were also inferior in development to those of Gauss; and the anterior lobes were voluminous in another celebrated mathematician, Professor De Morgan, whose brain is in Bastian’s possession.[35] _Stammering._--Men of genius frequently stammer. I will mention: Aristotle, Æsop, Demosthenes, Alcibiades, Cato of Utica, Virgil, Manzoni, Erasmus, Malherbe, C. Lamb, Turenne, Erasmus and Charles Darwin, Moses Mendelssohn, Charles V., Romiti, Cardan, Tartaglia. _Lefthandedness._--Many have been left-handed. Such were: Tiberius, Sebastian del Piombo, Michelangelo, Fléchier, Nigra, Buhl, Raphael of Montelupo, Bertillon. Leonardo da Vinci sketched rapidly with his left hand any figures which struck him, and only employed the right hand for those which were the mature result of his contemplation; for this reason his friends were persuaded that he only wrote with the left hand.[36] Mancinism or leftsidedness is to-day regarded as a character of atavism and degeneration.[37] _Sterility._--Many great men have remained bachelors; others, although married, have had no children. “The noblest works and foundations,” said Bacon,[38] “have proceeded from childless men, which have sought to express the images of their minds, where those of their bodies have failed. So the care of posterity is most in them that have no posterity.” And La Bruyère said, “These men have neither ancestors nor descendants; they themselves form their entire posterity.”