The postnatal development of alveoli in premature infants.

The general gross features of dev alveoli of the lung in the foetus are are described in the textbooks pathology (Morison, 1952; Pott4 classical description of the developr divides its growth into three ph tubular and alveolar, of which the 1 last and chiefly after birth. Th growth was thought to be due largel; of breathing (Dubreuil, Lacoste 1936). However, Laumonier (19' and Laumonier (1953) from subje of the lungs of infants born premai evidence of prococious developmen 'prem' infants and suggested that ti lung was determined by maturity In order to elucidate some of th have attempted to put some aspects ment on an objective and measural and Mithal, 1960) and have show