ACTION OF NITRIC ACID 469 



After the animal is dead excise the stomach and examine 

 the walls and mucosa carefully. Do you find any changes? 

 Could you recognize these at the autopsy in a case of poi- 

 soning! How do the lesions compare with those produced 

 in the stomach by NaOH solution ? Are there any char- 

 acteristic color changes in the involved tissues? If a pa- 

 tient thus poisoned by swallowing a corrosive poison should 

 recover with what later complications might he be affected? 

 Would this hold for carbolic acid also? What do you 

 know about cicatrix (scar) formation after corrosive poi- 

 soning? From w r hat cause may persons thus affected die? 



Pour a few drops of sulphuric acid on a small area of the 

 stomach mucosa. Watch the changes in the appearance of 

 the tissues. Eepeat with hydrochloric acid. 



