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Excerpt: ...and, placing it beside a similar tube of the ordinary urine of an adult, look down into the two tubes, we shall observe that the milk urine has a singular greenish tint, which once seen cannot again be mistaken
If we put some of this urine in a test-tube carefully upon hot nitric acid, there is noticed none of the usual brown hue of oxidized pigment at the plane of contact. In fact, it is often difficult to see where the two fluids meet. The precise nature of this greenish-yellow pigment has not, I believe, been made out; but it seems clear that during a diet of milk the ordinary pigments of the urine disappear or are singularly modified. A single meal of meat will at once cause their return for a time. These results have been carefully re-examined at my request by Dr. Marshall in the Laboratory of the University of Pennsylvania, and his results and my own have been found to accord; while he has also discovered that during the use of milk the substances which give rise to the ordinary f
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