Models Showing the Development of the Frog

Consisting of 23 individual models showing the development of a fertilised frog's egg to a tadpole. A new production of Ziegler models after Prof. Ecker. Enlarged approximately 50 times. Diameter of a natural egg approximately 1.5 mm A. Stages of cleavage (Models 1 - 8) B. Stages of gastrulation (Models 9 - 9c), C. Organogenesis - formation of the neural tube (Models 10 - 11) D. Development of the tadpole (Models 12 - 14a) E. Swimming tadpoles (Models 15 - 17) Each model individually mounted on a stand with green base and in one piece.