CONTENTS OF PART I. 



INTRODUCTION : 

 GENERAL CONSIDERATIONS 

 Plan of Organisation 

 The Vertebrate type . 



PAGE 



Segmentation of the Body 

 Homology . 

 Symmetry of Form. 

 Descriptive terms 



PAGE 

 2 



4 



4 



4 



EMBRYOLOGY. 



the Gastrulation of 



STRUCTURE OF OVARIAN OVUM ; MATURA- 

 TION OF OVUM . . . . . 6, 9 



Formation of Polar Globules . . . 9 



Fertilization . . . . . .11 



Meaning of Polar Globules. . . . 12 



Theory of Minot 12 



Theory of Weissmann . . 14 



Recent Literature of the Ovum . .14 

 SEGMENTATION OF THE OVUM ; FORMA- 

 TION OF THE BLASTODERM . . 16, 17 



Gastrula Condition of the Vertebrate 

 Ovum . 



Views concerning 



Vertebrates ..... 



Inversion of Blastodermic Layers in some 

 Mammals ...... 



Historical view of Blastoderm . . . 



Characters of the Blastodermic Layers . 



Parablast theory of His .... 



Mesenchyme theory of Hertwig . . . 



Recent Literature of Blastoderm 

 EARLY CHANGES IN BLASTODERM . . 



Neural Canal. ..... 



Notochord ...... 



Separation of the Embryo 



Cleavage of Mesoblast . . . 



Formation of Body Cavity 



Formation of Mesoblastic Somites 



Cerebral Vesicles ..... 



Heart and Vascular System . . . 



Recent Literature of Early Changes in 

 Blastoderm ..... 

 DEVELOPMENT OF THE FCETAL MEM- 

 BRANES ; ATTACHMENT OF OVUM TO 

 U-IERUS 



Formation of the Amnion and Chorion . 



Formation of the Allantois . 



Changes in the Uterus and mode of 

 attachment of Ovum to Uterus . 



The Placenta . . - 



Separation of the Decidua at birth, and 

 regeneration of the Uterine Mucous 

 Membrane ...... 



Recent Literature of the Decidua . . 

 DEVELOPMENT OF THE NERVOUS SYSTEM 



Of the Spinal Cord .... 



Of the Brain 



21 



23 

 23 

 24 



27 

 30 

 30 

 32 



34 

 36 



42 

 42 

 43 



46 

 53 



55 

 55 

 57 



Further details regarding the develop- 

 ment of special parts of the Brain . 63 

 The fifth cerebral vesicle : Bulbar vesicle 

 or Metencephalon . . . . . 63 



The fourth cerebral vesicle : Cerebellar 

 vesicle or Epencephalon . . . . 66 



The third cerebral vesicle : Mesen- 

 cephalon : Mid-brain . . . .67 



The second cerebral vesicle : Thalamen- 

 cephalon . . . . . . 67 



The first cerebral vesicle : Prosencephalon 68 

 The Olfactory Lobes . . ... 71 



Formation of the Fissures andCon volutions 7 1 



DEVELOPMENT OF THE NERVES . . 73 



Spinal nerves . . . . 73 



Cranial nerves 75 



Optic nerves . . . . . . 79 



Olfactory lobe ..... 79 



Sympathetic nerves and ganglia . . 81 

 Recent Literature of the development of 

 the Nervous System . . . .81 



DEVELOPMENT OF THE EYE . . . 83 



Of the Retina 86 



Of the Lens 86 



Capsule of the Lens . . . -87 

 Vitreous humour ... -87 



Corneal epithelium . . . .87 



Sclerotic 88 



Choroid coat ...... 88 



Accessory structures . . . . . 89 



Lachrymal gland . . . . -89 



Lachrymal canals and ducts . . . 89 

 DEVELOPMENT OF THE EAR ; THE LABY- 

 RINTH ...... 89 



Accessory parts of the Organ of Hearing, 



External and Middle Ear . . -93 

 DEVELOPMENT OF THE NOSE . . . 95 

 Recent Literature of the development of 



the Sense Organs . , . .98 

 DEVELOPMENT OF THE ALIMENTARY CANAL 99 

 Of the Mouth and parts in connection 



with it 99 



Pharynx . . . . . . 101 



Tongue 102 



(Esophagus, Stomach, and Intestines . 103 



The Mesentery 104 



The Spleen 108 



