This is a vintage botanical illustration of nine different pollen grains, arranged in a 3x3 grid. The illustration is titled 'Mémoires des savants étrangers. Tab. X.' and 'Abhandlung über den Pollen.' The pollen grains are depicted in a highly detailed and artistic manner, with a focus on their unique shapes and surface textures. They are rendered in a combination of yellow, red, and brown hues, with intricate patterns and structures visible on their surfaces. Each pollen grain is unique in its shape and ornamentation. Some are spherical, while others are elongated or irregular. Some have smooth surfaces, while others are covered in spines, ridges, or other projections. The illustration is rendered in a delicate and precise style, with careful attention to detail. The use of color and shading adds depth and dimension to the pollen grains, making them appear three-dimensional. The background is a plain white, which helps to highlight the intricate details of the pollen grains. The illustration is a beautiful and informative example of botanical art, and it provides a fascinating glimpse into the microscopic world of pollen.