FOODS. 69 



Mount a drop of water containing a few grains of starch 

 and examine with the compound microscope. 



Observe : 



a. The shape of the grains. 



b. Their concentric structure. 



c. The hilum or centre of the curves. 



d. Sketch. 



Run a drop of iodine solution under the cover-glass and 

 notice the change in the grains of starch. 



IV. STARCH IN OTHER FOODS. 



Materials. Beans. Peas. Oatmeal. Tapioca. Farina. Rice. 

 Cornstarch. Sago. Barley. Indian meal. Wheat flour. Rye. 

 Crackers. Bread. Iodine solution. 



Apparatus. Test-tubes. Test-tube rack. Filter-paper. Funnel. 

 Evaporating dish. Bunsen burner. 



Experiment : 



Examine for starch one of the following : 



Beans, peas, oatmeal, tapioca, farina, rice, cornstarch, 

 sago, barley, Indian meal, wheat flour, rye, crackers, and 

 bread. 



1. Make a paste by grinding and mixing with cold 



water. 



2. Add hot water and thoroughly mix. 



3. Filter when necessary. 



4. Test the nitrate for starch with the iodine test. 



