This work appears to be an enlargement of a former one by Gradwohl and Blaivas, and is intended to be a textbook for laboratory workers and practitioners of medicine. As the authors state in the preface, "Blood chemical methods have come into their own in so far as clinicians are concerned. There is hardly a specialty in medicine in which these methods are not of importance in summing up the individual's disability. The methods touch upon the integrity of kidney and liver function, upon internal glandular secretory activity, upon operative risk, upon all that goes with metabolic function and dysfunction." The book is divided into four parts: part I, technic of blood chemistry, comprising sixteen chapters; part II, chemistry of urine, four chapters; part III, the interpretation of blood chemical observations, four chapters; part IV, basal metabolism, one chapter. The discussions of such general matters as equipment and installation of