A careful review of the literature indicates that the total failure of a lung to develop is exceedingly rare. Only 37 authentic cases have been reported. Twenty-four of the patients were children under 12 years of age. We wish to add to this series a case of our own. The patients in the recorded cases had the following age distribution : 3 stillborn infants (Gruber 1 and Minne and Gernez 2) ; 5 infants under 1 week of age (Maschka,3 Th\l=e'\remin,4 Miller,; 13 infants under 6 months of age (Hein,8 Stein,9 Th\l=e'\remin,4 Miller,5 [2 cases], Gross,
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