340 At7 INTRODUCTION TO ZOOLOGY. 



of old constituted the whole science of Zoology, 

 was only a stepping-stone towards the attainment of 

 the higher knowledge embodied in our modern ideas 

 of development and evolution. These in their turn 

 will serve as the firm foundation of a larger philo- 

 sophy : a science which will find place for clear and 

 sympathetic understanding of the manifold varying 

 forms under which we recognise the mysterious unity 

 called Life. 



