276 



ANlSrUAL REPORT SMITHSONIAN LNSTITUTION, 1942 



1935 1936 1937 1938 1939 1940 1941 1942 



FiGUEE 2. — Vitamin Bi. 



Another commercially important vitamin is nicotinic acid, or 

 niacin, as it is called for the benefit of those who object to consuming 

 nicotinic acid because they associate the name with nicotine. It is 

 used in the cure and prevention of pellagra and is available on the 

 market in various pharmaceutical forms, sometimes in combination 



1937 



1938 1939 1940 1941 1942 



Figure 3. — Nicotinic acid. 



