Likewise you find extreme statements repeated concerning the evils of vaccination; but if you will read Parkman's "History of the Jesuits in North America," you will see the horrible conditions under which the Indians lived in the United States--noble savages, you understand, entirely uncontaminated by civilized white men, and whole populations regularly wiped out every few years by epidemics of smallpox. That these epidemics ceased was due to the discovery that by infecting the body with a mild form of the disease, it could be made to develop substances which render it immune to the deadly form. Here in California we have a law which makes vaccination for school children optional, and so we may some day have another epidemic to test the theories of the anti-vaccinationists. I know, of course, the dreadful stories of people who have been given syphilis and other diseases by impure vaccines. I don't know whether such stories are true; but I do know that people who live in houses are sometimes killed by earthquakes and by lightning, yet we do not cease to live in houses because of this chance. It seems to me that the remedy for such vaccination evils is not to abolish vaccination, but to take more care in the manufacture of our vaccines. This danger is removed by using vaccines which are sterile, and are made especially for each person. Germs are taken from the sick person, and injected into an animal. The body of the animal develops with great rapidity the "anti-bodies" necessary to resistance to the germs; and as these "anti-bodies" are chemical products, not affected by heat, we can take a serum from the animal, sterilize it, and then inject it into the system of the patient, thus increasing resistance to the disease. I admit that the best way to increase such resistance is to take care of your health; but sometimes we confront an emergency, and must use emergency remedies. We have serums that really cure diphtheria and meningitis, and one that will prevent lock-jaw; anyone who has ever seen with his own eyes how the deadly membranes of diphtheria melt away as a result of an injection, will be less dogmatic about the efforts of science to combat disease.