In this book, Elie Metchnikoff presents three lectures on the prevention of infectious diseases. Metchnikoff was a Russian biologist who won the Nobel Prize in Physiology or Medicine in 1908 for his work on immunity. He believed that good hygiene and nutrition could prevent disease and extend life. The lectures cover topics such as the role of microbes in disease, the importance of cleanliness, and the benefits of vaccination. An informative and...