CONTENTS. xxix 



different species Darwin's Theory of Natural Selection 

 Wallace worked out the same Theory independently Sketch 

 of the Theory of Natural Selection Selection of Animals by 

 Man Selection by Natural Causes Difficulties in Natural 

 History which are explained by this Theory The present 

 state of Biological Science Geographical distribution Carni- 

 vorous Plants Fertilisation of Plants Weissman on Germ- 

 plasma Foundation of new Zoological Classifications Dis- 

 coveries of Fossil Animals by Professor Marsh Links thus 

 afforded in the Animal Series Concluding Remarks on the 

 History of Science . ...... 457 



