'The Wolf, and Striped Hyaena; and Cantharis Insects', 1800.
© Science Museum / Science & Society Picture Library
Engraving by J Pass, showing a snarling wolf and hyena, with cantharis beetles, also known as Spanish fly. The dried bodies of these insects can be used to make a toxic preparation which causes blisters, and was believed to be an aphrodisiac. Illustration from 'Encyclopaedia Londinensis, or, Universal Dictionary of Arts, Sciences, and Literature' published in London, 1810-1829.