Mrs. Stockmann. Yes, that is quite true.

Dr. Stockmann. At the time, we supposed the visitors had been
infected before they came; but later on, in the winter, I began
to have a different opinion; and so I set myself to examine the
water, as well as I could.

Mrs. Stockmann. Then that is what you have been so busy with?

Dr. Stockmann. Indeed I have been busy, Katherine. But here I had
none of the necessary scientific apparatus; so I sent samples,
both of the drinking-water and of the sea-water, up to the
University, to have an accurate analysis made by a chemist.

Hovstad. And have you got that?

Dr. Stockmann (showing him the letter). Here it is! It proves the
presence of decomposing organic matter in the water--it is full
of infusoria. The water is absolutely dangerous to use, either
internally or externally.

Mrs. Stockmann. What a mercy you discovered it in time.

Dr. Stockmann. You may well say so.

Hovstad. And what do you propose to do now, Doctor?

Dr. Stockmann. To see the matter put right, naturally.