226 University of California Puhlications in Anatomy [Vol. 2 



the receptor org'ans and their afferent paths when fully developed 

 exhibit a ** spatial" arrangement of neurons. In the case of organs 

 and paths dealing with non-localizable forms of stimuli (smell, gusta- 

 tion) a "spatial" arrangement of neurons is absent. (Some of the 

 ideas expounded above are to various degrees expressed here and there 

 in the works of Parsons, Child, Parker, Uexkiill, Ariens Kappers, 

 Bok, Herrick, Weizsacker, Sherrington, Ramon y Cajal, Russel, 

 Monakow, V. Franz, Plate, Darwin, Wallace, Ettlinger, Hanstrom, 

 Tsehermak, et al.) 



