Popular Mechanics, huhtikuu 1932
It is the color, and not the odor, of flowers that attracts butterflies. This was proved in tests in Germany where paper flowers were scatered in a garden with blooming ones. it was found that the insects settled indiscriminately on both kinds to seek food. The experiment further revealed that different species displayed preferences for special colors, some yellow and blue, others blue and purple, but none of them was attracted by green.