Rensselaer Republican, Volume 18, Number 13, Rensselaer, Jasper County, 3 December 1885 — The Eyes of Flies. [ARTICLE]

The Eyes of Flies.

The small round projections on the side of the head of the house-fly are not eyes like those to be seen in larger members of the animal kingdom. Each projection contains many thousands of eyes disposed in rows, each one of which is capable of transmitting an impression of outward objects, and by this means a fly can see as well from behind as before, as well above as below, arid is therefore put on its guard against an attack from any direction. An ordinary drone fly has not less than 14,000, and the dragon is the possessor of not less than U 7,000 eyes. It has been practically demonstrated by means of the microscope that each one of those eyes is capable of receiving an independent and distinct' impression,