MORPHOLOGICAL CHANGES IN THE LUNGS OF RATS LIVING UNDER COMPRESSED AIR CONDITIONS.

1. The alveolar cells in the lungs of young rats are greater in number and size than in old rats, a gradual transition to the state in the latter occurring from about the 4th to the 6th months of life. 2.

BODILY CHANGES AND DEVELOPMENT OF PULMONARY RESISTANCE IN RATS LIVING UNDER COMPRESSED AIR CONDITIONS.

1. 244 albino rats from standard Wistar Institute stock have been kept for periods up to 72 days under the following conditions. (a) Barometric pressure: 3040 mm.