August Krogh Few Quotations

For a large number of problems, there will be some animal of choice, or a few such animals, on which it can be most conveniently studied.

I 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.