viii CONTENTS 



SECTION PAGE 



5. Nerve (Transverse Section of Sciatic Nerve) . 49 



6. The Skin 49 



7. The Intestine (Transverse Section of Ileum) . 50 



X. EMBRYOLOGY 52 



1. Cleavage and Germ Layer Formation ... 52 



2. Early Embryos and Larvae 54 



3. The Dissection of the Tadpole {Rana catesbiana) 55 



Appendix 57 



Index 61 



