HOW ANIMALS DEVELOP 



FIG. PAGE 



17. AN ORGANIZER GRAFT IN THE NEWT 68 



18. AN ORGANIZER GRAFT IN THE CHICK 



facing page 64 



19. A GRAFTING EXPERIMENT IN THE 



SEA-URCHIN 74 



20. DEVELOPMENT OF THE DRAGON-FLY 76 



21. DEVELOPMENT OF THE EYE IN 



VERTEBRATES 79 



22. SELF-DIFFERENTIATION OF THE LEG 



BONES OF A CHICK facing page ^o 



23. DEVELOPMENT OF THE EYE IN THE 



OCTOPUS 89 



24. CATERPILLAR 9I 



25. WHITEMOOR MARSHALLING YARD, 



L.N.E.R. facing page f^^ 



26. DIFFERENT TYPES OF PLACENTA IO7 



27. GROWTH OF MAN AND GORILLA IIO 



28. VEGETARIAN AND CARNIVOROUS TAD- 



POLES 112 



29. EFFECTS OF THE PITUITARY GLAND 



facing page 112 



30. FACES OF MEN AND DOGS focing page 1 16 



