352 MANUAL OF HISTOLOGY. 



seen. The openings from the alveoli are at first lined with 

 fine, flat cells ; then, as the tube grows larger, they assume the 

 character of cylindrical epithelium. 



BIBLIOGRAPHY. 



GBAKFK u. SAEMTSCH. Handbuch der gesammten Augenheilkunde. Vol. I, 



Leipzig, 1874. 



J. ORTH. Cursua der normal en Htstologie. Berlin, 1878. 

 A. ALT. Lectures on the Human Eye. New York, 1880. 



