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A few years later, Dutch microbiologist Martinus Beijerinck became interested in the causes of tobacco tobacco disease. He came to the conclusion that the plant was infected with a toxic liquid which he called a virus (from Latin for poison). However, it is a very strange poison: its concentration does not affect the results and it is always the same. The origin of the poison remained a mystery until 1932, when Professor Windel Stanley received a crystal cup extracted from a ton of infected leaves. When he rubbed the leaves of healthy plants with those crystals, he created the typical pathologies in them. Halloween the beatles abbey road shirt. However, living organisms cannot turn into crystals. This led Stanley to conclude that viruses are tiny protein molecules, not living organisms. And the virus was first seen only seven years later using an electron microscope.