For some years past we have been much impressed by the frequency with which albumin, varying in amounts from very slight to marked traces, has been reported present in the urines of children we have seen in private practice. In these children we have been unable to detect abnormalities which we considered sufficient to account for the albumin.
Stimulated by these findings, we undertook the studies set forth in this paper and in presenting them we shall not undertake a discussion of the extensive and valuable work which has been done on the albuminurias, but merely state the results of our own work. Our purpose has been to determine the frequency of occurrence of albuminuria, and, if possible, to throw some light on the cause of this frequency. To this end we have made examinations of the urines of 124 presumably normal children taking samples at frequent intervals on the