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Continue to ChatI found it possible to observe at least the superficial capillaries of muscles both in the frog and in mammals through a binocular microscope, using strong reflected light as a source of illumination. Resting muscles observed in this way are usually quite pale, and the microscope reveals only a few capillaries at fairly regular intervals. - August Krogh from https://whatsmyquote.com/quote/i-found-it-possible-to-observe-at-least-the-superficial-capillaries-of-muscles-both-in-the-frog-and-in-mammals