Morphological Studies. 



Nr. 4. The Nose and Jacobsoii^s Organ. 



By 

 J. Beard, Ph. D., B. Sc, 



Zoologist to the Scottish Fishery Board, University of Edinburgh. 



Aus clem Anatomischen Institut zu Freiburg i./Br. 



With Plates XXXVI— XXXVIII. 



Introduction. 



In the following pages it is proposed to review and extend our 

 knowledge of the morphology and development of the Vertebrate ol- 

 factory organ, and to examine to what extent its development con- 

 forms to the description given in the second of these Studies (37) 

 on the development of the cranial sense organs, ganglia, and nerves. 

 In a former paper (36) on the branchial or lateral sense organs, some 

 new views of the nature of the nose were enunciated and supported 

 by certain facts of development. In fine, it was attempted to bring 

 the nose and ear into the same category of sense organs as those of 

 the lateral line, or as they were then called, the branchial sense 

 organs. 



The conclusions then published have been challenged by three 

 morphologists, whose views and statements we shall have occasion to 

 examine and criticise. 



Dr. VAN WijHE (55) and Prof. Emery (50), (through his pupil 

 Madrid-Moreno), have opposed my conclusions on the grounds of em- 

 bryological researches, on the other hand, Prof. Gegenbaur (45) has 

 challenged them from the standpoint of the comparative anatomist. 



