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x Title: The fly: Fig. 1. Section of Fly, showing nervous system, &c.: a, wing; b, nervous system, Fig. 2. Antenna of fly, Fig. 2a. Sensory depressions and closed sacs on the same, highly magnified. , Fig. 3. One of the halteres, Fig. 3a, b. Vesicles at the base of the same, highly magnified, Fig. 4. Leg of fly: a, coxa; b, trochanter; c, femur; d, e, tibia; f, tarsus, Fig. 5. Trachea, or respiratory tube, with coil.