are, I notice, still interested in our older inhabitants and I would, therefore, call your attention to a skull, which we have recently found in the alluvial gravels of this immediate vicinity..."
 

Soon after the doctor wrote back saying that he thought that the skull was probably not much older than ten thousand years, humans of those days being at best very scarce on the continent. Professor Willis had judged that the geological deposits in which the skull was found werer more than four thousand years old. Considering the scarcity