One definite and in some sense new departure in the results of the shared enthusiasms of nations has been the industrial legislation of recent years. That has been already dealt with. But, although in an economic age such as ours industrial reform may seem the most striking, it is not the only effect of our shared enthusiasm and later ages may not think it the most important. There has been reform of social evils owing to the interchange between nations of ideas on education, religious toleration, medicine, and sanitation, the treatment of criminals, the suppression of slavery and many other subjects. All these and many more reforms are, as it were, registered in institutional (legal or administrative) change. Perhaps it is better to begin with a definite instance of the working of an ideal, lest it may seem that we are speaking only of an empty aspiration. We may take as an example the reforms connected with medicine and sanitation, and those only in so far as they have been officially established by the joint action of states. This is a very restricted embodiment of a social ideal, since of course we may find the same use of common labour between men of different races in the private contest with disease or in the municipal preventive medicine which in every great city owes much to investigators and practitioners of other nations. But it is better to take the most tangible effect in purely governmental action. The French Government proposed an international conference, which met in 1851, to deal with infectious disease; and a second conference met in 1856. In 1865 the outburst of cholera in the East led to a third congress at Constantinople. Great Britain opposed treaties for regulating quarantine, &c., because of the delay which might be caused to the pursuit of shipping interests. But at last a treaty was made in 1892 at Venice for protection against cholera. Further and more effective treaties were agreed to by civilized states in 1897 and 1903. A bureau of information concerning infectious disease was established at Paris, and commissions to supervise were established in Turkey and Egypt. With regard to sleeping sickness Great Britain took the initiative; and a conference met in 1907, in London, at which six countries were represented. So much with respect to disease; we may now turn to examples of the joint action of states as regards crime. The African slave traffic has been dealt with since 1885 (Berlin Conference) by the European States acting together on certain general principles. And what is known as the White Slave traffic was the subject of arrangement between fifteen states in the conference at Paris in 1902. Again, the reform of prisons and penitentiaries has been much assisted by international congresses since 1846. The last was held in 1910 in America, at which twenty-eight states were represented. A secretariat has been established at Berne for the exchange of expert opinion and for making suggestions to governments.