The same with the cancer.

I have found its microbe.

But all is not done.

See what I must give up in leaving Paris." "Why give all this up?
Could you not continue your researches in Auvergne ?" "It is impossible, for many reasons that are too long to explain, but one will suffice.

The culture of these parasites can be done only in certain temperatures rigorously maintained at the necessary degree, and these temperatures can be obtained only by stoves, like the one in my laboratory, fed by gas, the entrance of which is automatically regulated by the temperature of the water.