CONTENTS. 



PAOB 



STROMNESS AND ITS ASTEROLEPIS. — THE LAKE OP STENNIS . 1 



THE DEVELOPMENT HYPOTHESIS, AND ITS CONSEQUENCES . . 12 



THE RECENT HISTORY OF THE A8TER0LEPIS.— ITS FAMILY . . 22 



CEREBRAL DEVELOPMENT OF THE EARLIER VERTEBRATA. — ITS APPA- 

 RENT PRINCIPLE 35 



THE ASTEROLEPIS. — ITS STRUCTURE, BULK, AND ASPECT . . 66 



FISHES OF THE SILURIAN ROOKS, UPPER AND LOUVER. — THEIR RECENT 



HISTORY, ORDER, AND SIZE 106 



HIGH STANDING OF THE PLACOIDS. — OBJECTIONS CONSIDERED . 123 



THE PLACOID BRAIN. — EMBRYONIC CHARACTERISTICS NOT NECESSARILY 



OF A LOW ORDER 135 



THE PROGRESS OP DEGRADATION. — ITS HISTORY . . . 155 



EVIDENCE OF THE SILURIAN MOLLUSCS. — OF THE FOSSIL FLORA. — AN- 

 CIENT TREE 177 



SUPERPOSITION NOT PARENTAL RELATION.— THE BEGINNINGS OF LIFE 200 



LAMARCKIAN HYPOTHESIS OF THE ORIGIN OP PLANTS.— ITS CONSE- 

 QUENCES 212 



THE TWO FLORAS, MARINE AND TERRESTRIAL. — BEARING OP THE EX- 

 PERIENCE ARGUMENT 230 



