56 THE LUNGS, BY FRANZ EILHARD SCHULZE. 



but are united into fasciculi accumulated beneath the longitu- 

 dinal folds. The stroma is composed of a loose form of connective 

 tissue with delicate fibres, for the most part running longitu- 

 dinally, and which towards the inner surface becomes con- 

 Fig. 128. 



Fig. 128. Epithelium of a bronchial twig 4 millimeters in diameter, 

 from the Dog, recent. Magnified 320 diameters. 



densed into a hyaline layer. Upon this last or so-called 

 basement membrane rests the ciliated columnar epithelium 

 that invests all bronchia of the sizes that are now under 

 consideration. 



Intermediate to the ciliated cells, which in the larger bronchia 

 of Man are about 0'08 of a millimeter in height, but are some- 

 what flattened in the smaller, and the medium-sized cilia of 

 which strike towards the outlet of the tubes, cup, goblet, or cha- 

 lice cells, of which I first gave a description, are distributed 

 with tolerable regularity* and in considerable numbers. When 

 these are carefully examined in perfectly fresh specimens, 

 the whole theca may be seen to be filled with a mucous mass, 

 through which numerous highly refractile granules are distri- 

 buted, and which projects from the upper rounded opening of 

 the cell in the form of a small ball, that sometimes becomes 

 altogether detached. In addition to these, apparently mem- 

 brane! ess and probably young cellular elements of rounded 

 or indefinite form, are here and there found scattered between 

 the usually attenuated or irregularly dilated attached extre- 

 mities of the columnar cells which they are destined to replace. 



The principal difference existing between the larger bronchi 

 that have just been described and those whose diameter does 



* M. Schultze's Archivfiir Mikroskop. Anatomie, Bandiii., p. 192, et seq. 



