毫无疑问，人类需要注重自己实际利益的人，他们努力工作，谋取自身的利益，这是与人类的普遍利益并行不悖的。但是，人类毕竟也需要具有理想主义的人，他们对大公无私的崇高境界进行追求，没有时间去顾及自身的物质利益。追求理想主义的人因为无意于追求物质享受，因此也就没有享受物质的可能。但是，我认为一个完善的社会应该向这些理想主义者提供必要的研究经费和个人生活保证，使他们没有任何牵挂地潜心于自己的科研事业。
Chapter III At War
IN ， it happened， as it often had in other years， that my daughters had left Paris for their summer vacation before me. They were accompanied by their governess， in whom I had all confidence， and were living in a small house on the seashore in Brittany， at a place where there were also the families of several of our good friends. My work did not generally permit me to pass the entire vacation near them without interruption.
That year I was preparing to join them in the last days of July， when I was stopped by the bad political news， with its premonitions of an imminent military mobilization. It did not seem possible for me to leave under these conditions， and I waited for further events. The mobilization was announced on August st， immediately followed by Germany's declaration of war on France. The few men of the laboratory staff and the students were mobilized， and I was left alone with our mechanic who could not join the army because of a serious heart trouble.
The historic events that followed are known to every one， but only those who lived in Paris through the days of August and September， ， can ever really know the state of mind in the capital and the quiet courage shown by it. The mobilization was a general wave of all France passing out to the border for the defense of the land. All our interest now centered on the news from the front.
After the uncertainties of the first days this news became more and more grave. First， it was the invasion of Belgium and the heroic resistance of that little country； then the victorious march of the German army through the valley of the Oise toward Paris； and soon the departure of the French government to Bordeaux， followed by the leaving of those Parisians who could not， or would not， face the possible danger of German occupation. The overloaded trains took into the country a great number of people， mostly of the well-to-do class. But， on the whole， the people of Paris gave a strong impression of calm and quiet decision in that fateful year of . In the end of August and the beginning of September the weather was radiant， and under the glorious sky of those days the great city with its architectural treasures seemed to be particularly dear to those who remained in it.
When the danger of German attack on Paris became pressing， I felt obliged to put in security the supply of radium then in my laboratory， and I was charged by the government to take it to Bordeaux for safety. But I did not want to be away long， and hence decided to return immediately. I left by one of the trains that were carrying government staff and baggage， and I well remember the aspect of the national highway which is at intervals in view from the train； it showed a long line of motor-cars carrying their owners from the capital.
Arriving at Bordeaux in the evening， I was very embarrassed with my heavy bag including the radium protected by lead. I was not able to carry it and waited in a public place， while a friendly ministry employee who came by the same train managed to find a room for me in a private apartment， the hotels being overcrowded. The next morning I hurried to put the radium in a safe place， and succeeded， although not without difficulty， in taking a military train back to Paris in the evening of the same day. Having opportunity for exchanging a few sentences with persons on the place who wanted to ask information from people coming by the train， I was interested to notice how they seemed surprised and comforted to learn of some one who found it natural to return to Paris.
My trip back was troubled by delays； for several hours the train rested immovable on the rails， while the travelers accepted a little bread from the soldiers who were provided with it. Finally arriving in Paris， I learned that the German army had turned； the battle of the Marne had begun.
In Paris I shared the alternating hope and grief of the inhabitants during the course of that great battle， and had the constant worry of foreseeing a long separation from my children in case the Germans succeeded in occupying the city. Yet I felt that I must stay at my post. After the successful outcome of the battle， however， any immediate danger of occupation being removed， I was able to have my daughters come back from Brittany to Paris and again take up their studies. This was the great desire of my children， who did not want to stay away from me and from their work， even if many other families thought it wiser to stay in the country， far from the front.
The dominant duty imposed on every one at that time was to help the country in whatever way possible during the extreme crisis that it faced. No general instructions to this were given to the members of the University. It was left to each to take his own initiative and means of action. I therefore sought to discover the most efficient way to do useful work， turning my scientific knowledge to most profit.
