96 The Development of the Lungs 
ing end buds (Fig. 2771) which now have an extremely complicated con- 
tour and show widely dilated lumina. As they begin to pack together 
in the lobule, the connective tissue is compressed between them, and its 
nuclei in consequence appear more numerous. From the low cubical 
Texe Hie. 28. 
Text Fie. 28. Section of a lobule of the lung of an embryo pig 27 cm. 
long. Same preparation as used with the tissue shown in Fig. 21, except that 
the lung was distended with the fixing fluid. 130. b=bronchiolus. br= 
bronchiolus' respiratorius. i1=ductulus alveolaris. a — atria. 1= lym- 
phatics. 
epithelium of the smaller bronchi (Fig. 270) the transition is easy to 
follow over into the irregular flattened epithelium that now lines the 
young respiratory lobules. The nuclei are pressed against the sides of 
