430 Prof. G. Retzius. Principles of the [June 15, 
5 6 7 8 
Fic. 9.—Schemes of the various Sensory Organs, with their different Sensory Cells and 
Nerve-endings. 1. The sensory nervous system of an oligochete worm (Lumbricus). 
2. The sensory nervous system of a polychzte worm (Nereis). 3. The sensory nervous 
system of a mollusc (Limax). 4. The sensory nervous system of a mammal (the skin), 
5. The organ of smell in the Vertebrata. 6. The organ of sight in the Vertebrata. 
7. The auditory organ in the Vertebrata. 8. The organ of taste in the Mammals. 
9. The tactile organ in the Vertebrata. 
But other opponents now came forward who had devised new methods 
and arrived at other conclusions regarding the minute structure of the 
nervous system. First came the Hungarian zoologist Stephan Apathy, of 
Kolosvar, who after some smaller communications published a larger book 
