Various, The Great Round World And What Is Going On In It…
“ On such occasions the scientists are always very busy. While some of the doctors are trying to cure the disease, others are busy preventing the sick persons from carrying the contagion to other places, and others again are occupied in trying to find the cause of the epidemic, and how to prevent it in future.One of the scientists who have been working to prevent the disease has discovered the microbe which causes yellow fever, and claims that an epidemic can in future be prevented by inoculating people with it in the same way that they are now vaccinated for small-pox. ”
