This is a vintage scientific diagram titled 'Chemistry of Combustion and Illumination; Structure of Flame.' It depicts a flame as a complex arrangement of atoms and arrows, illustrating the chemical processes involved in combustion. The flame itself is stylized, with a central bright white core surrounded by a larger, teardrop-shaped area of varying shades. Within this area, numerous small squares and rectangles represent atoms. These atoms are color-coded: * **Red squares** represent oxygen. * **Blue rectangles** represent carbonic acid. * **White squares with dots** represent water. Arrows are scattered throughout the diagram, indicating the direction of currents of gases. These arrows point both inward and outward, suggesting the flow of reactants and products during combustion. The diagram is presented on a cream-colored background with black text and labels. The overall style is reminiscent of 19th or early 20th-century scientific illustrations, emphasizing clarity and detail over artistic expression.