For several miles the continued reiteration of this preoccupied him and then he perceived that the rain had become thicker and more opaque in the heavy gray of twilight and that the houses were falling away. The district of full blocks, then of big houses, then of scattering little ones, passed and great sweeps of misty country opened out on both sides. It was hard walking here. The sidewalk had given place to a dirt road, streaked with furious brown rivulets that splashed and squashed around his shoes.