With his great success in other countries， the complete appreciation of Pierre Curie in France， however tardily， did at last follow. At forty-five he found himself in the first rank of French scientists and yet， as a teacher， he occupied an inferior position. This abnormal state of affairs aroused public opinion in his favor， and under the influence of this wave of feeling， the director of the Academy of Paris， L. Liard， asked Parliament to create a new professorship in the Sorbonne， and at the beginning of the academic year - Pierre Curie was named titular professor of the Faculty of Sciences of Paris. A year later he definitely quitted the School of Physics where his substitute， Paul Langevin， succeeded him.
This new professorship was not established without a few difficulties. The first project had provided for a new chair， but not for a laboratory. And Pierre Curie felt that he could not accept a situation which involved the risk of losing even the mediocre means of work that he then had， instead of offering better ones. He wrote， therefore， to his chiefs， that he had decided to remain at the P.C.N. His firmness won the day. To the new chair was added a fund for a laboratory and personnel for the new work (a chief of laboratory， a preparator， and a laboratory boy). The position of chief of laboratory was offered to me， which was a cause of very great satisfaction to my husband.
It was not without regret that we left the School of Physics， where we had known such happy work days， despite their attendant difficulties. We had become particularly attached to our hangar， which continued to stand， though in a state of increasing decay， for several years， and we went to visit it from time to time. Later it had to be pulled down to make way for a new building for the Physics School， but we have preserved photographs of it. Warned of its approaching destruction by the faithful Petit， I made my last pilgrimage there， alas， alone. On the blackboard there was still the writing of him who had been the soul of the place； the humble refuge for his research was all impregnated with his memory. The cruel reality seemed some bad dream； I almost expected to see the tall figure appear， and to hear the sound of the familiar voice.
Even though Parliament had voted the creation of a new chair， it did not go so far as to consider the simultaneous founding of a laboratory which was， nevertheless， necessary to the development of the new science of radioactivity. Pierre Curie therefore kept the little workroom at the P.C.N.， and secured as a temporary solution of his difficulty the use of a large room， then not being used by the P.C.N. He arranged， too， to have a little building consisting of two rooms and a study set up in the court.
One cannot help feeling sorrow in realizing that this was a last concession， and that actually one of the first French scientists never had an adequate laboratory to work in， and this even though his genius had revealed itself as early as his twentieth year. Without doubt if he had lived longer， he would have had the benefit of satisfactory conditions for his work， but he， was still deprived of them at his death at the premature age of forty-eight. Can we fully imagine the regret of an enthusiastic and disinterested worker in a great work， who is retarded in the realization of his dream by the constant lack of means？ And can we think without a feeling of profound grief of the waste -- the one irreparable one -- of the nation's greatest asset： the genius， the powers， and the courage of its best children？
Pierre Curie had always in mind his urgent need for a good laboratory. When， because of his great reputation， his chiefs felt obliged to try to induce him， in ， to accept the decoration of the Légion d'Honneur， he declined that distinction， remaining true to the opinion already referred to in a preceding chapter. And the letter he wrote on this occasion was inspired by the same feeling as that in the one previously quoted， when he wrote to his director to refuse the palmes académiques. I quote an extract： "I pray you to thank the Minister， and to inform him that I do not in the least feel the need of a decoration， but that I do feel the greatest need for a laboratory."
After he was named professor at the Sorbonne， Pierre Curie had to prepare a new course. The position had been given a very personal character and a very general scope. He was left great freedom in the choice of the matter he would present. Taking advantage of this freedom he returned to a subject that was dear to him， and devoted part of his lectures to the laws of symmetry， the study of fields of vectors and tensors， and to the application of these ideas to the physics of crystals. He intended to carry these lessons further， and to work out a course that would completely cover the physics of crystallized matter which would have been especially useful because this subject was so little known in France. His other lessons dealt with radioactivity， set forth the discoveries made in this new domain， and the revolution they had caused in science.
