204 PHYSIOLOGICAL CHEMISTRY 



5. Preparation of an Extract of Maltase. Treat the finely divided epithelium 

 of the small intestine of a cat, kitten, or pig (embryo or adult) with about 3 

 volumes of a 2 per cent solution of sodium fluoride and permit the mixture to 

 stand at room temperature for 24 hours. Strain the extract through cloth and 

 use the strained material in the f ollowing demonstration. 



6. Demonstration of Maltase. Proceed exactly as indicated in the demon- 

 stration of lactase, p. 203, except that a i per cent solution of maltose is sub- 

 stituted for the lactose solution. The extract used may be prepared from the 

 upper part of the intestine of a cat, kitten, or pig (embryo or adult). In the case 

 of lactase, as indicated, the intestine used should be that of a kitten, puppy, or 

 pig (embryo). 



