SALIVA AND SALIVARY DIGESTION. 149 



saliva for iodine. At first the tests are all negative, but in time a reaction 

 appears on treating the saliva with something to liberate the iodine in 

 presence of starch paste. Solution of sodium hypochlorite may be used 

 for this purpose. The time required to exhibit this absorption and secre- 

 tion with the saliva varies greatly in different individuals. 



