“The owner of the fingers from which these prints were made is in this room. It was from typhoid germs on these fingers that the fever was introduced into the drinking water at Bisbee Hall.”

Kennedy paused to emphasise the statement, then continued. “I am now going to ask Dr. Leslie to give us a little talk on a recent discovery in the field of typhoid fever—you understand, Commissioner, what I mean, I believe?”

“Perfectly. Shall I mention names?”

“No, not yet.”

“Well,” began Dr. Leslie, clearing his throat, “within the past year or two we have made a most weird and startling discovery in typhoid fever. We have found what we now call 'typhoid carriers'—persons who do not have the disease themselves, perhaps never have had it, but who are literally living test-tubes of the typhoid bacillus. It is positively uncanny. Everywhere they go they scatter the disease. Down at the department we have the records of a number of such instances, and our men in the research laboratories have come to the conclusion that, far from being of rare occurrence, these cases are comparatively common. I have in mind one particular case of a servant girl, who, during the past five or six years, has been employed in several families.

“In every family typhoid fever has later broken out. Experts have traced out at least thirty, cases and several deaths due to this one person. In another case we found an epidemic up in Harlem to be due to a typhoid carrier on a remote farm in Connecticut. This carrier, innocently enough, it is true, contaminated the milk-supply coming from that farm. The result was over fifty cases of typhoid here in this city.

“However, to return to the case of the servant I have mentioned. Last spring we had her under surveillance, but as there was no law by which we could restrain her permanently she is still at large. I think one of the Sunday papers at the time had an account of her—they called her 'Typhoid Bridget,' and in red ink she was drawn across the page in gruesome fashion, frying the skulls of her victims in a frying-pan over a roaring fire. That particular typhoid carrier, I understand—”

“Excuse me, Commissioner, if I interrupt, but I think we have carried this part of the programme far enough to be absolutely convincing,” said Craig. “Thank you very much for the clear way in which you have put it.”

Craig snapped the announcer, and a letter appeared on the screen. He said nothing, but let us read it through.

To whom it may concern: