112 



WALTER NEUHAUS 



Fig. 1. Cross section through the olfactory cavity of a one-year-old pigeon, 

 haematoxylin Held., 10 : 1. 



^ib."* . Mm 



n *. * ^ ".^ 



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«w I 



i 



Fig. 2, Oltactory cells in rcgio oltactoria of a one-year-old pigeon. 6/<, iron 

 haematoxylin, 900 : 1. 



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mM "/ ' % 



