"Models on the development of the vertebrate eye, first made around 1876 under the direction of he Freiburg Professor, Willhelm Manz, after the work of Wilhelm His., Nathaniel Leiberkuhn and Leonhard Kessler. Developing brain (and optic vesicle), white; epidermis and lens, blue-green. Models 1-7 of the chick. 8 of a mammalian and 9 of a 'vertebrate' eye." "Models 5 & 6 represent frontal and saggital sections of the eye in model 4" Hopwood, Nick. Embryos in wax. Models from the Ziegler studio. Cambridge and Bern: Whipple Museum of the History of Science, Univ. of Cambridge, and Institute of the History of Medicine, Univ. of Bern, 2002. 206pp.