STUDIES FROM THE NEUROLOGICAL LABORA- 

 TORY OF DENISON UNIVERSITY. 



X. The Nose and Jacobson's Organ with Especial Ref- 

 erence to Amphibia. 



By H. H. Bawden, Jr., A. B. 



Fellotv in Physiological Psychology. 



I. Introductory. 



It is the purpose of this introduction, first that \vc may be- 

 come well-orienated ourselves in undertaking to carry on our 

 original investigation ; and further to assist those who may not 

 be so familiar with this particular subject in taking in the full 

 significance of any new facts which have recently been estab- 

 lished. It is designed also to group together a few significant 

 generalizations which seem important in this connection. If 

 this sketch appears imperfect, it must be remembered that other 

 points are elaborated below. 



The olfactory organ as one of the five principal organs of 

 sense takes an important place in the studies of the Morpholo- 

 gist. Offering, as it appears to, at first sight, greater simplicity 

 of structure than either the optic or auditory apparatus, it has 

 seemed to promise an easier field for investigation as well as -a 

 greater variety of results. But upon deeper and closer study 

 the true complexity of the relations, both morphological and 

 histological, is brought to light, and the more far-reaching the 

 study, the greater the emphasis which is laid upon the fact. 

 The only means therefore by which we can soon acquaint our- 

 selves with the main facts is by viewing the whole question suc- 

 cessively from different standpoints. The great diversity in the 

 configuration of the peripheral organs allows great range for 

 comparison, while the circuitous internal connections, though 



