During his voyage out he obtained Brazilian cochineal beetles at Rio de Janeiro .
During his voyage out he transported them to Delagoa Bay , thereby predating the introduction to Bengal of this insect for the making of scarlet dyes and carmine .
During his voyage out he obtained Brazilian cochineal beetles at Rio de Janeiro and transported them to Delagoa Bay , thereby predating the introduction to Bengal of this insect for the making of scarlet dyes and carmine .