90 IPECACUANHA. 



or spot around which is seen numerous rings. Frequently these 

 are as large as -^ of an inch in length. A very simple way 

 for obtaining some of these starch grains for study is to cut in- 

 to a potato, and the fine white powder adhering to the knife will 

 be the starch, or if a thin slice of the potato be shaved off and 

 placed in a little water in a watch crystal the fine white sedi- 

 ment found at the bottom will be the starch. Fig. 6 illustrates 

 some powdered ipecac adulterated with potato starch. 



