Specimen Lake, Upper Basin.

A Glimpse of the Geyser Basin, Yellowstone National Park.

Grand Geyser Cone and safety valve, Yellowstone National Park.

Grand Geyser Cone and safety valve, Yellowstone National Park.

Gibbon Falls, Gibbon River, Yellowstone National Park.

Devil's Thumb, Soda Deposit, Yellowstone National Park.

Petrified Tree.

Great Falls, 360 feet.

Rapids above the Upper Falls.

Hayden Valley.

Hot Spring Cone, Yellowstone Lake.

Glimpse of the Tetons.

Castle Geyser.

Lone Star Geyser Cone.

Castle Geyser.

Crater of the Splendid Geyser.

Splendid Geyser.

Giant Geyser, Bryant Profile.

Riverside Geyser.

The Mammoth Paint Pots.

Gibbon Falls, 84 feet.

Minute Geyser, Norris Basin.

Obsidian Cliff.

Golden Gate and Bridge.

Golden Gate and Pillar.

Limestone Hooder, near Golden Gate.

Pulpit Terrace, Mammoth Hot Springs.

Jupiter's Terrace, Mammoth Hot Springs.

Orange Geyser.

Orange Geyser, Mammoth Hot Springs.