"The various objects on the surface of the earth may be divided into two great classes, the living and the non-living; the former being characterized by the possession of certain properties which the latter lack. The first of the distinctive properties of living matter is the power of movement; and of movement having an internal rather than an external origin. These movements are either from place to place, as in animals; or movements of growth and foliage as in plants. It is by the property of movement that we instinctively distinguish living and lifeless."
These sentences, introductory to chapter I of "Mr." Mathews book—in former days he objected to Doctor or Professor—recall lectures and discussions which for this reviewer, as a beginning student of medicine, were vivid and memorable. Mathews then, in 1907, recently had been elevated to the chair of physiologic chemistry at the University of Chicago. Much that