Its contents include accurate, beautifully drawn illustrations by Hooke himself of insect life as he saw it under his microscope. His most famous drawing is that of a flea.
وقد تضمن هذا الكتاب صورا دقيقة ومتقنة لعالم الحشرات رسمها هوك بنفسه نقلا لما رآه بواسطة مِجهره .‏