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Using the Fitzpatrick skin phototype scale, which is a numerical measure of skin color and type used by dermatologists, the researchers assessed the response of different skin types to UV light.

The plates are phototype reproductions from photographs of Patroclus, taken in action by Baldwin Coolidge.

In enlarging them by solar prints for the phototype process, the shadows of the horse have been darkened, or in some instances, where a negative has been blurred or injured, an indistinct line has been strengthened.

To preserve anatomical accuracy, the finer results of both photography and of the phototype process have had to be sacrificed.

Phototype, fō′tō-tīp, n. a type or plate of the same nature as an engraved plate, produced from a photograph.—n.