Magnified caterpillar eggs, 1787.
© Science Museum / Science & Society Picture Library
'Magnified view of the eggs taken off the tree after the caterpillar had eat it's way through them' (Fig 1); vertical section of the eggs, showing oval shape (Fig 3); horizontal section through the middle of the egg (Fig 5). Figs 7 and 8 are possibly fish scales. Illustration from 'Essays on the microscope' by George Adams (1750-1795), published in London in 1787. Adams was instrument maker to King George III. In the text of the book he says that the beauty, delicacy and ever varying colours of the material observed 'give the spectator a high degree of rational delight'.