The two chapters on “Mutual Aid in the Medieval City” treat the guild as the chief manifestation of the principle during this period. A picture is presented, in some detail of the struggle of the free cities against the increasing encroachments of the centralizing states. The medieval cities are finally defeated, the guilds destroyed, but the indestructible principle of mutual aid takes on new forms and accommodates itself to new conditions. This brings us to the closing chapters on “Mutual Aid Among Ourselves.” The first of these two chapters is devoted almost entirely to the mutual aid habits and institutions which still survive in the present day villages of Russia, Switzerland, France and Germany. The last chapter takes up really modern instances of the principle, the first and most important are the Labor unions and their strikes, Co-operative societies, Life-boat associations, Charitable organizations. The illustration of this principle which is cited first after the Labor union is the Socialist movement. Kropotkin presents his conception of the Socialist movement as a manifestation of mutual aid in existing society in the following eloquent passage: “Every experienced politician knows that all great political movements were fought upon large and often distant issues, and that those of them were the strongest which provoked most disinterested enthusiasm. All great historical movements have had this character, and for our own generation Socialism stands in that case. ‘Paid agitators,’ is, no doubt, the favorite refrain of those who know nothing about it. The truth however, is that--to speak only of what I know personally--if I had kept a diary for the last twenty-four years, the reader of such a diary would have had the word ‘heroism’ constantly on his lips. But the men I would have spoken of were not heroes; they were average men, inspired by a grand idea. Every Socialist newspaper--and there are hundreds of them in Europe alone--has the same history of years of sacrifice without any hope of reward, and, in the overwhelming majority of cases, even without any personal ambition. I have seen families living without knowing what would be their food tomorrow, the husband boycotted all round in his little town for his part in the paper, and the wife supporting the family by sewing, and such a situation lasting for years, until the family would retire, without a word of reproach, simply saying: ‘Continue; we can hold out no more!’ I have seen men, dying from consumption, and knowing it, and yet knocking about in snow and fog to prepare meetings within a few weeks from death, and only then retiring to the hospital with the words: ‘Now friends I am done; the doctors say I have but a few weeks to live. Tell the comrades I shall be happy if they come to see me.’ I have seen facts that would be described as ‘idealization’ if I told them in this place; and the very names of these men, hardly known outside a narrow circle of friends,