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Between the sclerotic and the subjacent choroid coat is a lymph space traversed by some loose pigmented connective tissue,—the 92 lamina fusca.

What is the color of the external surface of the choroid coat?

The choroid coat is a bell-shaped, dark membrane which lines the sclerotic.

From this he concludes, that the defect of vision is owing to the want of the choroid coat, and, consequently, that this coat is the proper organ of vision.

The choroid coat, which constitutes the second investing membrane of the eye, is of a dark brown color upon its outer surface, and of a deep black within.