Evolution of life, Philadelphia, 1873., This illustration features various microscopic organisms and their life stages. At the top, several forms of Monera are depicted, showcasing their diverse shapes and division processes, including a Protamoeva and a dividing form labelled 'P. dividing.' The central part highlights different types of Amoebae, illustrating their movement and division behaviors. Below, Euglena and Peridinium are shown, highlighting their unique structures. Finally, the stages of Gregarina are illustrated, indicating the development of these parasitic protozoans within their host, labeled with detailed descriptions of their characteristics and life processes.