I find it hard to make a strong connection between the pairs of images. The population density was different, I don't know the time of day or day of week, and can think of other factors which help explain the differences.<p>"Watch pedestrians casually mingle with horse-drawn buggies, street cars, and slow-moving early automobiles"<p>I've also seen modern scenes of people casually mingling with slow-moving modern automobiles.<p>Then there's Pierre Curie, co-discoverer of radium, who in 1906 slipped, fell under a heavy horse-drawn cart, and died.