The fitness and the external advantages of such a scheme are evident. First of all, the danger of disconnectedness now disappears completely. If the sciences are to examine what binds them together, their usual isolation must be given up for the time being and a concerted effort must control the day. The bringing together of scholars of all scientific specialties is then no longer a doubtful accidental feature, but becomes a condition of the whole undertaking. More than that, such a topic, with all that it involves, makes it a matter of course that the call goes out to the really leading scholars of the time. To aim at a correlation of sciences means to seek for the fundamental principles in each territory of knowledge and to look with far-seeing eye beyond the limits of its field; but just this excludes from the outset those who like to be the self-appointed speakers in routine gatherings. It excludes from the first the narrow specialist who does not care for anything but for his latest research, and ought to exclude not less the vague spirits who generalize about facts of which they have no concrete substantial knowledge, as their suggestions towards correlation would lack inner productiveness and outer authority. Such a plan has room only for those men who stand high enough to see the whole field and who have yet the full authority of the specialistic investigator; they must combine the concentration on specialized productive work with the inspiration that comes from looking over vast regions. With such a topic the usual question does not come up whether one or another strong man would feel attracted to take part in the gathering, but it would be justified and necessary to confine the active participation from the outset to those who are leaders, and thus to guarantee from the beginning a representation of science equal in dignity to the best efforts of the exhibiting countries in all other departments. In this way such a plan had the advantage of justifying through its topic the administrative desire to bring all sciences to the same spot, and at the same time of excluding all participants but the best scholars: with isolated gatherings or with second-rate men, this subject would have been simply impossible.