The School of Physics could give us no suitable premises， but for lack of anything better， the Director permitted us to use an abandoned shed which had been in service as a dissecting room of the School of Medicine. Its glass roof did not afford complete shelter against rain； the heat was suffocating in summer， and the bitter cold of winter was only a little lessened by the iron stove， except in its immediate vicinity. There was no question of obtaining the needed proper apparatus in common use by chemists. We simply had some old pine-wood tables with furnaces and gas burners. We had to use the adjoining yard for those of our chemical operations that involved producing irritating gases； even then the gas often filled our shed. With this equipment we entered on our exhausting work.
Yet it was in this miserable old shed that we passed the best and happiest years of our life， devoting our entire days to our work. Often I had to prepare our lunch in the shed， so as not to interrupt some particularly important operation. Sometimes I had to spend a whole day mixing a boiling mass with a heavy iron rod nearly as large as myself. I would be broken with fatigue at the day's end. Other days， on the contrary， the work would be a most minute and delicate fractional crystallization， in the effort to concentrate the radium. I was then annoyed by the floating dust of iron and coal from which I could not protect my precious products. But I shall never be able to express the joy of the untroubled quietness of this atmosphere of research and the excitement of actual progress with the confident hope of still better results. The feeling of discouragement that sometimes came after some unsuccessful toil did not last long and gave way to renewed activity. We had happy moments devoted to a quiet discussion of our work， walking around our shed.
One of our joys was to go into our workroom at night； we then perceived on all sides the feebly luminous silhouettes of the bottles or capsules containing our products. It was really a lovely sight and one always new to us. The glowing tubes looked like faint， fairy lights.
Thus the months passed， and our efforts， hardly interrupted by short vacations， brought forth more and more complete evidence. Our faith grew ever stronger， and our work being more and more known， we found means to get new quantities of raw material and to carry on some of our crude processes in a factory， allowing me to give more time to the delicate finishing treatment.
At this stage I devoted myself especially to the purification of the radium， my husband being absorbed by the study of the physical properties of the rays emitted by the new substances. It was only after treating one ton of pitchblende residues that I could get definite results. Indeed we know to-day that even in the best minerals there are not more than a few decigrammes of radium in a ton of raw material.
At last the time came when the isolated substances showed all the characters of a pure chemical body. This body， the radium， gives a characteristic spectrum， and I was able to determine for it an atomic weight much higher than that of the barium. This was achieved in . I then possessed one decigramme of very pure radium chloride. It had taken me almost four years to produce the kind of evidence which chemical science demands， that radium is truly a new element. One year would probably have been enough for the same purpose， if reasonable means had been at my disposal. The demonstration that cost so much effort was the basis of the new science of radioactivity.
In later years I was able to prepare several decigrammes of pure radium salt， to make a more accurate determination of the atomic weight and even to isolate the pure radium metal. However， was the year in which the existence and character of radium were definitely established.
We had been able to live for several years entirely engrossed in the work of research， but gradually circumstances changed. In my husband was offered a professorship in the University of Geneva， but almost simultaneously he obtained a position of assistant professor at the Sorbonne， and I was made professor at the Normal Superior School for young girls at Sèvres. So we remained in Paris.
I became much interested in my work in the Normal School， and endeavored to develop more fully the practical laboratory exercises of the pupils. These pupils were girls of about twenty years who had entered the school after severe examination and had still to work very seriously to meet the requirements that would enable them to be named professors in the lycées. All these young women worked with great eagerness， and it was a pleasure for me to direct their studies in physics.
But a growing notoriety， because of the announcement of our discoveries， began to trouble our quiet work in the laboratory， and， little by little， life became more difficult. In I finished my doctor's thesis and obtained the degree. At the end of the same year the Nobel prize was awarded jointly to Becquerel， my husband and me for the discovery of radioactivity and new radioactive elements. This event greatly increased the publicity of our work. For some time there was no more peace. Visitors and demands for lectures and articles interrupted every day.
The award of the Nobel prize was a great honor. It is also known that the material means provided by this prize was much greater than is usual in prizes for science. This was a great help in the continuation of our researches. Unhappily， we were overtired and had a succession of failures of health for the one or the other of us， so that it was not until that we were able to go to Stockholm， where my husband gave his Nobel lecture and where we were well received.
