The Strand Magazine ran an alarming feature in 1910: “If Insects Were Bigger.” The editors inserted photographs of ordinary English insects into contemporary Edwardian street scenes, with pretty terrifying results. “What a terrible calamity, what a stupefying circumstance, if mosquitoes were the size of camels, and a herd of wild slugs the size of elephants invaded our gardens and had to be shot with rifles!” “Panic Caused by a Mosquito in Piccadilly Circus.” “Terrible Attack by a Larva of the Puss-Moth at Covent Garden.” “The Araneus Diadema Spider Descends Upon Trafalgar Square.” “Fierce Onslaught by an Earwig in St. James’s...