14 



V. G. DETHIER 



o 



i 



UJ 



tr 



i 



5 



0.04 0.1 1.0 10 



OIL/ WATER PARTITION COEFFICIENT 



Fig. 12. Relation between human taste thresholds for alcohols, ethanol to octanol, 

 and the oil/water partition coefficient. Threshold values are expressed as the ratio of 

 the molar threshold in oil to the molar threshold in water. 



Fig. 13. Typical chemosensory hair of the blowfly, Phormia regina Meigen, show- 

 ing the three bipolar neurons two of which send distal fibers to the terminal papilla 

 by way of the thick-walled lumen of the hair (Dethier, 1955). 



