Stressing the complementarity of form and function, as well as the adaptation of organisms to their environment, many charts in this series incorporate habit sketches to augment understanding of the adaptability of life. Encompassing more than 300 individual illustrations in vivid colors, each of the 35 charts features one or more central portraits augmented by numerous supplementary detail figures.

• 1911 - Animal Cell and Plant Cell
• 1881 - Protista
• 1882 - Coelentrates (Cnidaria)
• 1883 - Flatworms and Roundworms
• 1884 - Earthworm
• 1885 - Crayfish
• 1886 - Grasshopper
• 1887 - Honeybee
• 1888 - Clam
• 1889 - Perch
• 1890 - Frog Development
• 1891 - Frog Anatomy
• 1892 - Bird Studies
• 1912 - Animal Mitosis
• 1913 - Animal Meiosis
• 1910 - Pathogenic Microorganisms
• 1894 - Green and Brown Algae
• 1895 - Wheat Rust Life Cycle
• 1896 - Liverwort Life Cycle
• 1897 - Moss Life Cycle
• 1898 - Fern Life Cycle
• 1899 - Gynosperms
• 1901 - Roots
• 1902 - Stems
• 1903 - Leaves
• 1904 - Flowers
• 1900 - Monocot and Dicot Seed Germination
• 1893 - Plant Mitosis
• 1915 - Plant Meiosis
• 1905 - Mendelian Heredity
• 1909 - Two Kingdom Classification System
• 1914 - Evolution of The Five Kindgoms
• 1908 - Concealing and Warning Adaptations
• 1907 - Symbiosis
• 1906 - Carbon, Oxygen, and Nitrogen Cycles