The explanation takes you over to the "health cranks." They understand that your blood-stream must be clogged, your bodily tone reduced by bad air and lack of exercise, and more especially by over-eating, or by an improperly balanced diet. But then most of them go to extremes, and insist that the automobile ride and the chilled condition of my body had nothing to do with my cold. But I know otherwise--I have watched the thing happen so often. In times when I was run down, the slightest exposure would cause me a cold, literally in a few minutes. I have got myself a sore throat going out to the wood-pile on a winter day with nothing on my head. I have got a cold by sitting still with wet feet, or by sitting in a draft on a warm summer day, when I had been perspiring a little. How to explain this I am not sure, but my guess is that you drive the blood away from the surface of the body at a time when it is weakened and exposed to infection, and you drive away the army of the white corpuscles, and give the battlefield of your body to the germs. I know there are nature curists who argue that germs have nothing to do with disease; but they have never been able to convince me--germs are too real, and too many, and too easy to watch. If you leave a piece of meat exposed to the air in warm temperature, the germs in the air will settle upon it and begin to feed upon it and to multiply; the meat, being dead, is powerless to protect itself. But your nose and throat are also meat, and just as good food for the germs. The only difference is that this meat is alive, there is a living blood-stream circulating through it, and several score billions of the body's own kind of germs, the blood corpuscles. If these blood corpuscles are sound and properly nourished, and are brought to the place of infection, they are able to destroy all the common germs; so it is that you do not have diseases, but instead have health. But your health always implies a struggle of your organism against other organisms, and it is the business of your reason to watch your body and give all the help you can in protecting it. Coughs and colds, sore throats and headaches, are the first warnings that your defenses are being weakened. As a rule these ailments are not serious in themselves, but they are signs of a wrong condition, and if you neglect this condition, pretty soon you will find that you have to deal with something deadly.