It was no sooner said than done, and no sooner was it done than Tom revived. After blinking his eyes for a moment, he asked:

"Did you fellows finish the painter?"

"Indeed we did," answered Jack; "but it's you old fellow, that we're concerned about now."

"That's all right," said Tom, "but that fellow's hide is worth a good many dollars, and better than that, we're rid of him. If I hadn't shot him he would have dropped from a tree upon some one or other of us, and in that case he wouldn't have left anything for the Doctor to do."

Meanwhile the Doctor was carefully cleansing the boy's wounds and drenching them in water in which disinfectant tablets from his pocket case had been dissolved. Here and there it was necessary to draw the edges of deep gashes together by a stitch or two with a surgical needle. "But the main thing," the Doctor expounded, "is to cleanse and disinfect the wounds. Nature itself," he added, "will repair any wound that does not involve a vital part, if it is cleansed and kept clean. The danger always is that the wound will become infected, that inflammation and blood poisoning will set in and kill the patient. Fortunately, we surgeons know now how to prevent that, and I'll answer for it that nothing of the kind shall happen to little Tom."

"But what is it that causes the inflammation and blood poisoning?" asked Harry.

"Microbes," answered the Doctor; "little things that you can't see without a microscope—and some that you can't see with one. The greatest advance that was ever made in medical and surgical science was the discovery of the fact that nearly all diseases and all hurtful and dangerous inflammation is due to the presence of microbes in a wound. The moment the Doctors found that out they set to work to kill the microbes. They studied them under the most powerful microscopes. They tried all sorts of experiments with them till they learned how to kill them. Thus they discovered two greatly good things—antiseptic surgery first and after that aseptic surgery. Antiseptic surgery aims to kill all the evil germs that are already in a wound. Aseptic surgery aims to keep all evil germs out of the wounds that the surgeon must make."

"Would you mind giving us some illustrations, Doctor?" asked Jack.

"Certainly not, if you are interested," said the Doctor.

"I have practiced both antiseptic and aseptic surgery on little Tom to-night, so his case will serve to illustrate both. I have washed all his wounds with a solution of bi-chloride of mercury, commonly called corrosive sublimate, for the purpose of killing all the germs that may have got into them from that beast's claws or in any other way. That was antiseptic surgery. Then, wherever I found it necessary to take a stitch or two, I have used ligatures drawn directly out of a disinfecting solution, and perhaps you observed that I thoroughly disinfected my needles and other implements by passing them through a blaze before using them. So, also, as to my hands. Before touching Tom's wounds I thoroughly scoured my hands in a solution of corrosive sublimate, so that they might not carry any possible infection to the scratches. All that is aseptic surgery. In the hospitals, where all conditions can be controlled they do this aseptic business completely. First of all, they have an operating table made of glass, which absorbs nothing and could be easily and perfectly cleansed after each operation by mere washing with water. But not content with that they scour the table with a disinfecting solution immediately before every operation. Then the surgeon, his assistant, and all the attendants are clad in garments that have been rendered 'sterile' as they call it, by roasting. So of all the towels and sheets and everything else employed about the patient's person. Everything is sterilized. The bandages and the thread or the catgut to be used are drawn from thoroughly disinfected supplies. The surgeon's instruments of every kind are laid in a panfull of a disinfecting fluid, and there are so many of each that if any one of them is accidentally dropped its use is abandoned and another is used in its stead. But come! Little Tom, you are comfortable now. Why not tell us how it all happened?"