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This study was undertaken at the suggestion of Dr. Joseph Brennemann of The Children's Memorial Hospital for the purpose of finding out what pathologic changes were present in the lungs of children to account for shadows seen in the roentgenogram, and of formulating some standards which could be used in interpreting the roentgenograms from the standpoint of both disease and a normal condition. I hoped to correlate the clinical and physical observations and the pathologic changes with the roentgenograms, and to ascertain the value and correctness of each as they apply to the patient as a whole. Although much has been written on these subjects individually, it has been only in recent years that an exact correlation of the pathologic process and the roentgen observations has been given the attention that it deserves. Osler1once said, "More than any others, radiographers need the salutary lessons of the dead house
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John A. Bigler (1929) studied this question.
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