There are few fields in medicine in which the available facts are so little known and utilized by the practitioner as in nephritis. He continues to make the diagnosis of this disease by the finding of albuminuria. The patient's progress is measured by the amount of this albumin, and the treatment is prescribed in a similar way. There is, perhaps, a reasonable excuse for a lack of knowledge of tests of function and fine details of our modern knowledge. But there is absolutely no excuse for ignorance about those simple principles of pathologic physiology and elementary dietetics that are of immediate use to our patients.
We all ought to know that in nephritis the body has more or less difficulty in handling water, salt and nitrogen. We know that if we give much water or salt these substances will be retained and the swelling increased in the edematous types of