Prior to this, scientists were usually called "natural philosophers" or "natural historians." (The oldest scientific journal in the world, established in 1665, is entitled ''Philosophical Transactions of the Royal Society of London.'' Among its early numbers are letters from Leeuwenhoek describing his discovery of [[microorganism]]s). | Prior to this, scientists were usually called "natural philosophers" or "natural historians." (The oldest scientific journal in the world, established in 1665, is entitled ''Philosophical Transactions of the Royal Society of London.'' Among its early numbers are letters from Leeuwenhoek describing his discovery of [[microorganism]]s). |