Journal of morphology . Lung of crocodile. Lung of bird. S, air-sac; A, atrium; B, bronchus ; BB, air-bag. as shown in cut 5. In these animals the lung for the first timegives the structure as it is found in mammals. There aremany air-sacs which communicate with a common cavity, oratrium, all of which in turn communicate with a singleterminal bronchus. A single lobule of the mammalian lung issimply enlarged to form the lung of the crocodile ; the lungof the former is only a conglomerate of that of the hmg. — ln many respects the birds lung varies con- 172 MILLER. [Vol. VIII. sider
Journal of morphology . Lung of crocodile. Lung of bird. S, air-sac; A, atrium; B, bronchus ; BB, air-bag. as shown in cut 5. In these animals the lung for the first timegives the structure as it is found in mammals. There aremany air-sacs which communicate with a common cavity, oratrium, all of which in turn communicate with a singleterminal bronchus. A single lobule of the mammalian lung issimply enlarged to form the lung of the crocodile ; the lungof the former is only a conglomerate of that of the hmg. — ln many respects the birds lung varies con- 172 MILLER. [Vol. VIII. siderably from that of the reptile or from that of the difference seems to be so great that in the past it hasbeen very difficult to compare them satisfactorily. As soon asthe bronchus enters the lung it breaks up into a number oftubes, one of which is shown in Fig. 9. Each of these tubesrapidly breaks up into a number of pipes which lie in great partimmediately below the surface of the lung and clasp it as ton
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