THE SCIENTIFIC ART OF ERNST HAECKEL.

“Kunstformen del Natur” (Art Forms of Nature) is Haeckel’s masterwork. Published in 1904, it contains 100 illustrations of animals and sea-life in two volumes. The illustrations were originally published in ten sets over the previous six years.
Here are some examples of the plates. Above, bivalve shells. Below, sea squirts.

Moths.

Lizards.

Sea snail shells.

Ringed worms.

Slime molds.

Hummingbirds.

Tree of Life
Haeckel was strongly influenced by Charles Darwin’s seminal book: “On the Origin of the Species.”
This diagram is from “Anthropogenie oder Entwickelungsgeschichte des Menschen” (Anthropogeny or the Evolution of Man), 1874.

My previous post featured Taschen’s “History of Information Graphics”:
https://wp.me/p7LiLW-33l
There’s a page in the book about Haeckel’s “Radiolaria.” (Protozoa with a diameter of 0.1 to 0.2 mm. They have mineral skeletons.)
Below is one of the plates.