158 The Inorganic Components of Saliva 



included duct epithelium without the duct lumen iodide concen- 

 tration was still apparent. In Chapter X evidence is given based 

 on kinetic studies for assuming that concentration of iodide in the 



pd 



dd 





bv 



li 



Fig. 8.10. Radioautographic localization of I 131 in the parotid gland of the 



hamster. 



Upper photograph: gland stained by periodic acid — SchifT. Lower photograph: radioautograph. 

 Activity is present over the distal ducts, pd, proximal duct; dd, distal duct; bv, blood vessel 

 (Cohen, Logothetopoulos and Myant, 1955). 



duct cells occurs in the dog parotid gland and also for concluding 

 that little or no iodide can enter the saliva via the acini. 



It seems probable that in all the species in which iodide can be 

 concentrated in the saliva, this is accomplished by some part of the 

 duct epithelium. Cohen and Myant observe that they can find no 



