THE OLFACTORY REACTIONS OF THE NEWT 273 



CONCLUSIONS 



i. The approach to an object, such as cotton, filter paper or 

 meat, is a visual response. 



2. When the object is nosed its edibility is being tested by 

 the sense of smell. 



3. Snapping at beef juice and stationary edible objects are 

 reactions dependent on stimulation of the olfactory receptors by 

 substances in dilute solution. 



4. The seizure of a moving inedible object is a reaction prob- 

 ably correlated with the character of the natural food of the 

 newt. In all likelihood sight is the sense used by Diemyctylus 

 in the capture of actively moving organisms, whereas other 

 food located through vision is often recognized as such by the 



sense of smell. 



REFERENCES 



Baglioni, S. Contributions experimentales a la physiologie du sens olfactif et 



1909. du sens tactile des animaux marins. Archiv. Ital. de Biol., T. 52, 

 pp. 225-230. 



Copeland, M. The olfactory reactions of the puffer or swellfish, Spheroides macu- 



1912. latus (Bloch and Schneider). Jour. Exp. Zool., vol. 12, pp. 363-368. 



Parker, G. H. Olfactory reactions in fishes. Jour. Exp. Zool., vol. 8, pp. 535- 



1910. 542. 



1911. The olfactory reactions of the common killifish, Fundulus hetero- 



clitus (Linn.). Jour. Exp. Zool., vol. 10, pp. 1-5. 

 Reese, A. M. Food and chemical reactions of the spotted newt, Diemyctylus 



1912. viridescens. Jour. An. Behavior, vol. 2, pp. 190-208. 



Sheldon, R. E. The sense of smell in Selachians. Jour. Exp. Zool., vol. 10, 

 1911. pp. 51-62. 



