Viruses - the Microscopes Story
In Invisible Empire , Pranay Lal points out that it was the invention of the microscope that finally proved that “infinitesimally tiny organisms” did exist: “The microscope became a weapon for scientific validation.” The inventor of some of the best microscopes of the time, Antoine van Leeuwenhoek, wrote a lot about the different types of microbes he could see. These came to be called bacteria. As the microscopes kept getting better, the aim turned from curiosity to trying to identify which bacteria caused particular diseases. Man learnt to even isolate and grow bacteria in culture. In 1857, an unknown agricultural disease hit tobacco. Adolf Mayer found that whatever caused the disease could pass through filter paper. But not through double filter paper. He concluded that the microbe in question was a bacteria, but far tinier than anything that could be seen with the best equipment of the times. In 1885, Martinus Beijernick was investigating a different tobacco...