第18章 The Bacteriological Detective(3)

"I suppose you keep a record of them."

"Only their names--we can't follow them up outside the army, to see how it works.Still, when they come to us as you and Mr.

Jameson have done we are perfectly willing to vaccinate them.The Army Medical Corps takes the position that if it is good for the army it is good for civil life, and as long as only a few civilians apply we are perfectly willing to do it for a fee covering the cost.""And would you let me see the list?"

"Certainly.You may look it over in a moment."Kennedy glanced hurriedly through the short list of names, pulled out his notebook, made an entry, and handed the list back."Thank you, Major."Bisbee Hall was a splendid place set in the heart of a great park whose area was measured by square miles rather than by acres.But Craig did not propose to stay there, for he arranged for accommodations in a near-by town, where we were to take our meals also.It was late when we arrived, and we spent a restless night, for the inoculation "took." It wasn't any worse than a light attack of the grippe, and in the morning we were both all right again, after the passing of what is called the "negative phase."I, for one, felt much safer.

The town was very much excited over the epidemic at the hall, and if I had been wondering why Craig wanted me along my wonder was soon set at rest.He had me scouring the town and country looking up every case or rumour of typhoid for miles around.I made the local weekly paper my headquarters, and the editor was very obliging.He let me read all his news letters from his local correspondent at every crossroads.I waded through accounts of new calves and colts, new fences and barns, who "Sundayed" with his brother, etc., and soon had a list of all the cases in that part of the country.It was not a long one, but it was scattered.

After I had traced them out, following Kennedy's instructions, they showed nothing, except that they were unrelated to the epidemic at the hall.

Meanwhile, Kennedy was very busy there.He had a microscope and slides and test-tubes and chemicals for testing things, and Idon't know what all, for there was not time to initiate me into all the mysteries.He tested the water from the various driven wells and in the water-tank, and the milk from the cows;--he tried to find out what food had come in from outside, though there was practically none, for the hall was self-supporting.

There was no stone he left unturned.

When I rejoined him that night he was clearly perplexed.I don't think my report decreased his perplexity, either.

"There is only one thing left as far as I have been able to discover after one day's work," he said, after we had gone over our activities for the day."Jim Bisbee never drank the water from his own wells.He always drank a bottled water shipped down from a camp of his in New York State, where he had a remarkable mountain spring.I tested a number of the full bottles at the hall, but they were perfectly pure.There wasn't a trace of the bacillus typhosus in any of them.Then it occurred to me that, after all, that was not the thing to do.I should test the empty ones.But there weren't any empty ones.They told me they had all been taken down to the freight station yesterday to be shipped back to the camp.I hope they haven't gone yet.Let's drive around and see if they are there."The freight-master was just leaving, but when he learned we were from the hall he consented to let us examine the bottles.They were corked and in wooden cases, which protected them perfectly.

By the light of the station lamps and the aid of a pocket-lens, Kennedy examined them on the outside and satisfied himself that after being replaced in the wooden cases the bottles themselves had not been handled.

"Will you let me borrow some of these bottles to-night" he asked the agent."I'll give you my word that they will be returned safely to-morrow.If necessary, I'll get an order for them."The station-agent reluctantly yielded; especially as a small green banknote figured in the transaction.Craig and I tenderly lifted the big bottles in their cases into our trap and drove back to our rooms in the hotel.It quite excited the hangers-on to see us drive up with a lot of empty five-gallon bottles and carry them up-stairs, but I had long ago given up having any fear of public opinion in carrying out anything Craig wanted.

In our room we worked far into the night.Craig carefully swabbed out the bottom and sides of each bottle by inserting a little piece of cotton on the end of a long wire.Then he squeezed the water out of the cotton swab on small glass slides coated with agar-agar, or Japanese seaweed, a medium in which germ-cultures multiply rapidly.He put the slides away in a little oven with an alcohol-lamp which he had brought along, leaving them to remain overnight at blood heat.

I had noticed all this time that he was very particular not to touch any of the bottles on the outside.As for me, I wouldn't have touched them for the world.In fact, I was getting so Ihesitated to touch anything.I was almost afraid to breathe, though I knew there was no harm in that.However, it was not danger of infection in touching the bottles that made Craig so careful.He had noted, in the dim light of the station lamps, what seemed to be finger-marks on the bottles, and they had interested him, in fact, had decided him on a further investigation of the bottles.

"I am now going to bring out these very faint finger-prints on the bottles," remarked Craig, proceeding with his examination in the better light of our room."Here is some powder known to chemists as 'grey powder'--mercury and chalk.I sprinkle it over the faint markings, so, and then I brush it off with a camel's-hair brush lightly.That brings out the imprint much more clearly, as you can see.For instance, if you place your dry thumb on a piece of white paper you leave no visible impression.