Electric streetcars, horse-drawn carriages, and early automobiles jostle for position on the broad cobblestones of Empedradillo — the street running along the north side of Mexico City's great Zócalo — in this vivid aerial-perspective colorized view that buzzes with the energy of a capital city in post-revolutionary flux. In the background, the towers of the Palacio Nacional rise above formal garden squares; the right side of the frame is lined with multi-story European-style commercial buildings, their iron balconies crowded beneath striped canvas awnings. At least three trolley cars are visible threading through the mixed-traffic chaos, a scene that would vanish completely within two decades as Mexico City modernized. The sender, who signs only as "D. Boylan," posted the card from Mexico City D.F. on the 22nd at 5:45 PM, addressed to "Mrs. Z.G. Fraser" at 819 E. Palm St., Orange, California: "Mexico City, Feb 22 — I leave at noon for Tucson. It has been a delightful trip. Mexico is a most interesting country. The Mexicans are not well organized to handle the large crowd of tourists and there is considerable confusion. But the trip has been worth while. — D. Boylan."