178 THE MAIN CURRENTS OF ZOOLOGY 



tion on the structure of animals and founded com- 

 parative anatomy. He also laid foundations of the 

 science of Vertebrate Paleontology. On the whole, 

 his influence on the progress of zoology was so exten- 

 sive that he is to be heralded as one of the great path- 

 breakers. 



5. Von Baer. One of the great intellects of the 

 nineteenth century, von Baer (1792-1876), is to be 

 remembered for the great service of founding in 

 1828 embryology on modern lines. This has proved 

 to be one of the most helpful and illuminating lines 

 of zoological investigation. This supplemented the 

 work of Cuvier and from the two combined, compara- 

 tive anatomy and embryology of animals, for many 

 years proceeded the best results of zoological study. 



6. Johannes Mtiller. Johannes Mtiller (1801- 

 1858) made physiology comparative, and stimulated 

 researches in both physiology and morphology. 

 Through his superb talents and extraordinary 

 qualities as a leader he helped in a signal way to 

 advance the standards of zoological investigation. 

 By appointment a professor of physiology, he was 

 also an investigator in zoological lines (morphology) 

 and promoted exactness of observation and high 

 quality of work. Considered strictly as a phys- 



