Charles Lindbergh and his wife, Anne Morrow Lindbergh, purchased these quinine pills (used to treat malaria) in Para, Brazil during the latter part of their 1933 survey flights across the North and South Atlantic. Earlier in the trip the Lindberghs had to send home a can of insecticide spray (among other supplies) from Bathurst, Gambia so their over-loaded plane could take off. Since they were planning to fly up the Amazon River Basin, a vast jungle where contracting malaria would have likely been fatal, it was probably wise to buy quinine pills in Para to replace the insecticide they had to send home.