Candid photograph of Gilman and his wife, Elizabeth, playing chess at their home in Maine.

Candid photograph of Gilman and his wife, Elizabeth, playing chess at their home in Maine.

Candid photograph of Emerson at approximately 27 years old in a laboratory.

Candid photograph of Dr. Singewald at work in his laboratory.

Candid photograph of Dr. Mathews lecturing to a class in the micrologic lecture room.

Candid photograph of Dr. Mathews lecturing to a class in the micrologic lecture room.

Candid photograph of Dr. Mathews lecturing to a class in the micrologic lecture room.

Candid photograph of Dawson at approximately 29 years old in a laboratory.

Candid photograph of Adams and the Tomahawk Club in camp at an abandoned Indian village on Beausoleil Island, Georgian Bay, Canada.

Candid photograph of a street scene in Cuba. Photograph possibly taken by Jesse William Lazear.