What year did Antony van Leeuwenhoek start writing extensively about the tiny chambers he saw at microscope?

Antony van Leeuwenhoek began writing extensively about the microscopic observations he made in the 1670s. His detailed correspondence with the Royal Society of London, starting in 1673, documented his discoveries of tiny organisms and structures, which he referred to as "animalcules." These writings laid the foundation for microbiology and greatly advanced the understanding of microscopic life.