VI CONTENTS. 



FAOE 



Carboniferous System 59 



Permian System 63 



3^ Outline of tlie Genetic Plan of the Animal Kingdom .... 69 

 Bearing of this Plan on the Arguments of Objectors .... 76 



Beptiles of the Muschelktilk, Lias, &c 82 



Objections as to first Footmarks of Birds 85 



Objections as to Earliest Mammalia 87 



Tertiary Formation 90 



^ '• Opinions of Cuvier and Agassiz 99 



:; iApology of Mr. Sedgwick for Over-Ardent Generalizations . . 101 

 Physiological Objections of Dr. Clark, of Cambridge .... 103 

 Views of others respecting Embryotic Development .... 106 



Germs not alleged to be identical 109 



Transmutation of Plants Ill 



Species a Term, not a Fact 1 13 



v^ Instances of Transmutation 115 



Transmutation does not imply extinction of Elder Species . . 117 



The Broomfield Experiment 119 



Proof of Aboriginal Life in the present era not essential to the 



theory of Organic Creation by Law 121 



The Opposite Theory characterized . .125 



Views of Dr. Whewell, and objections to them 127 



Views of the Edinburgh Eeviewer — ^these analyzed .... 135 



Views of Professor Agassiz . 139 



Views of Sir John Herschel 141 



Support to Theory of Law from Rev. Dr. Pye Smith and Black- 

 wood's Magazine 143 



Mr. Stuart Mill on Universal Causation 145 



'' Present State of Opinion on the Origin of Organic Nature 



examined 149 



Animals have not come immediately on the occurrence of proper 

 conditions 151 



