On Goethe's vertebral theory of the origin of the skull--a recent approach.
D000663:Amphibians; D000818:Animals; D001717:Birds; D002642:Chick Embryo; D007312:Eulipotyphla; D005197:Famous Persons; D005399:Fishes; D005858:Germany; D006168:Guinea Pigs; D049672:History, 19th Century; D012104:Reptiles; D012886:Skull / Q000196:embryology*; D013131:Spine / Q000201:enzymology*