"... the experience of is well worth relating. While engaged in constructing an electric-light apparatus, he noticed that one of the lamps gave out a constant musical note. One evening he discovered everything near the box below this light was covered with mosquitoes, all males, notwithstanding the fact that the females preponderated in numbers in the vicinity. He found that when the lamps were set in action all male mosquitoes at once faced in the direction of the lamp which gave forth the musical note, and flew straight at it. The buzz of the lamp was practically identical in tone with that of the female mosquito."