Bücher der Reihe Topics in Hematology

apparent episodes of renal colic represent single nonrecurring events, physicians not in frequently approach the differential diagnosis of nephrolithiasis in a less than adequate fashion and assume that the incident may prob ably never recur after the single attack.

Each year, it becomes more apparent that trace elements play an important role in human metabolism. Although techniques now available are such that virtually alI trace elements can be determined with reasonable accuracy, the designation "trace ele ments" remains in popular usage.

Early Chemistry . . . . . . . . . . . . . . . . . . . . . . . . . . . Acute Porphyria . . . . . . . . . . . . . . . . . . . . . . . . . . . Classification of the Porphyrias . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 .

This monograph is the first of a series which is designed to present in depth timely reviews of subjects related to the blood.

I am prepared to predict that this monograph by Dr. Ernest Beutler will long serve as a model for monographs dealing with topics in medical science. Too often, a monograph is simply a review of past reviews.