To speculate without facts is to attempt to enter a house of which one has not the key, by wandering aimlessly round and round, searching the walls and now and then peeping through the windows. Facts are the key.


'Heredity I: The Behaviour of the Chromosomes', in Essays in Popular Science (1926), 1–2


To speculate without facts is to attempt to enter a house of which one has not the key, by wandering aimlessly round and round, searching the walls...

To speculate without facts is to attempt to enter a house of which one has not the key, by wandering aimlessly round and round, searching the walls...

To speculate without facts is to attempt to enter a house of which one has not the key, by wandering aimlessly round and round, searching the walls...

To speculate without facts is to attempt to enter a house of which one has not the key, by wandering aimlessly round and round, searching the walls...