From the article:
Haeckel produced illustrations that people could take in and understand, images that glowed with color and brought the exotic and remote in to the libraries of the world. Really, there had not been anything like these extraordinary prints before. They were the culmination of decades of works for Haeckel, a contemporary of Darwin and he did much to popularize the work of the English naturalist although their ideas did diverge at several important points, as we shall later discover.
Written by RJ Evans