Most meat and gelatin companies also made insecticides. B. Heller, in common with Jell-O, was one of them. The effects of insecticides on human consumers were not taken as seriously as they are now. Note the languages listed, a virtual inventory of Chicago’s ethnic butchers.

Pamphlet on Getting Rid of Roaches

B. Heller and Co.Collection 1896-2003.  Special Collections, University of Chicago Library.