OUTLINE OF BIOLOGICAL PROGRESS 21 



Bichat, his great contemporary, created another by laying 

 the foundation of our knowledge of the structure of animal 

 tissues. 



Von Baer, by his studies of the development of animal 

 life, supplied what was lacking in the work of (^uvier and 

 Bichat and originated modern embryology. 



Haller, in the eighteenth, and Johannes Miiller in the 

 nineteenth century, so added to the ground work of Harvey 

 that physiology was made an independent subject and was 

 established on modern lines. 



With Buffon, Erasmus Darw^in^ and Lamarck began an 

 epoch in evolutionary thought w^hich had its culminating 

 point in the work of Charles Darwin. 



After Cuvicr and Bichat came the establishing of the 

 cell-theory, which created an epoch and influenced all 

 further progress. 



Finally, through the discovery of protoplasm and the 

 recognition that it is the seat of all vital activity, arrived the 

 epoch which brought us to the threshold of the biology of 

 the present day. 



Step by step naturalists have been led from the obvious 

 and superficial facts about living organisms to the deep- 

 lying basis of all vital manifestations. 



