164 



BIOLOGY: GENERAL AND MEDICAL 



rapidity with which bees find honey and certain carrion 

 insects their concealed food suggest that such insects 

 possess this sense to a high degree. The antennae seem 

 to be the olfactory organs and possess nerve endings 

 supposed to be organs of scent, though certain organs 

 at the base of the wings in some flies and upon the caudal 

 appendages of other flies may be olfactory in nature. 



Among vertebrates the sense of smell is always situated 

 in the nose, upon the mucous membranes of which the 

 olfactory nerves distribute in varying number according 

 to the activity of the sense. These nerves communicate 

 with the olfactory lobes of the brain and constitute an 

 added source of complexity to that organ. 



Taste. This is another amplification and specializa- 



Process of 

 neuro-epi 



Epithe- Nerve- thelial Taste- 

 Hum, fibrils. cell. pore. 



Sustentacular 

 cell. 



Terminal . 

 branches of 

 nerves. 



FIG 65. Schematic representation of a taste-goblet. (Bohm, Davidoff, at 

 Huber.) 



tion of the chemotropic irritability of protoplasm. As 

 in the highest animals, this sense resides in certain dis- 

 tributed nerve endings in the tongue and palate, does 

 not take the form of a visible sensory organ, and so is 



