In recent years the precordial lead of the electrocardiogram has been found valuable in the diagnosis of myocardial involvement in adults.1 The criteria for normal adults have been established,2 but it seemed possible that these might not be accurate for children because of the anatomic differences in the chest. We therefore studied a series of normal children and in 1935 published a preliminary report3 of our findings. A significant variation from the tracings of adults appeared
(Footnotes continued on next page) in the frequent occurrence of an upright T wave,3a and in an effort to explain this difference between the records for the two age groups, a further investigation was made.
Seventy-one normal children4 were studied, thirty-six boys and thirty-five girls. The children had been observed carefully in an orphanage for several years and were known to be free from heart disease. No child