Observing chimpanzees at the Institute of Experimental Medicine (1936)

A chimpanzee in an enclosure at the Institute of Experimental Medicine before an experiment.

The chimpanzee assembles a pyramid of wooden parts.

An institute staff member records the chimpanzee's observations.

The chimpanzee places the top of the pyramid upside down and climbs to the top of the assembled pyramid.

The chimpanzee, sitting at the top of the pyramid, reaches for a treat hanging on a rope and eats it.

A building at one of the institute's buildings.

Institute staff wash the chimpanzee in a bathtub.

Lathering the chimpanzee.

The chimpanzee dries itself with a sheet.

A chimpanzee at a table with plates.

A chimpanzee's head.

One of the chimpanzees picks up an apple and eats it.

The chimpanzees eat from plates with spoons and drink from mugs.