ABSORPTION OF MINERAL SUBSTANCES 309 



brane of the stomach, caecum, colon and rectum although the separate portions 

 of the intestine appear to participate to a different degree in different species. 

 Elimination into the intestine appears to be accomplished by emigration of 

 leucocytes and desquamation of epithelial cells. In certain animals the kidneys 

 also take part in the process (Hall, Hochhaus and Quincke). 



It is asserted by Raudnitz that the absorption of calcium and strontium takes 

 place chiefly in the duodenum. 



