The difficulties of interpreting physical signs in the chests of infants and little children are sometimes very great. As the questions of diagnosis, prognosis and treatment are all involved, any methods of throwing light on doubtful problems should be carefully studied. Investigations made by various observers on the interpretation of roentgenograms of the chest contents have already given promising results. The present study is in the same line of inquiry, namely, how much or how little can be learned from roentgenograms, and how the latter can fortify or throw doubt on the diagnosis made from physical examinations.
In the growing child, the heart not infrequently affords ground for much difference of opinion in diagnosis and consequently in treatment. The muscle is soft and subject to dilatation in disease or even from overexertion. The adventitious sounds are various and not always easy to interpret. A study of the shadow