XIl] CILIATED CELLS. MUSCLE CELLS 93 



(relaxation) ; there is no perceptible pause between the 

 two movements. 



The results of ciliary action. Granules and blood- 

 corpuscles are driven along ; detached cells may also be 

 seen carried about by the action of their own cilia. 



The contracted, almost globular form of the 

 isolated cells. 



Note also the movements in a hanging drop. Cp. p. 12. 



6. Remove from osmic acid to water ; cut out a 

 piece of the mucous membrane, wash it gently with 

 water, place it in picrocarmine for ^ hour to a day, wash, 

 scrape off a little of the epithelium, transfer to a small 

 drop of water faintly coloured with picric acid, tease, 

 cover, and examine (h. p.). Note 



The patches of epithelium consisting of ciliated 

 cells and of swollen mucous (goblet) cells. Viewed from 

 the side, adjoining ciliated cells are seen nearly to 

 cover in at the surface the mucous cell between them. 

 Viewed from the surface, numerous, closely set, rather 

 faint dots represent the cilia, here and there are seen 

 the small round openings of the mucous cells, at a lower 

 focus the swollen portions of the mucous cells come 

 into view, surrounded by narrow stained bands, formed 

 of the bodies of the ciliated cells. 



The isolated ciliated cells. (If the isolation is not 

 good, tap the cover-slip.) The cilia are densely studded 

 over the whole surface. Beneath the cilia is a hyaline 

 or faintly striated layer, the hyaline border. A little 

 below this, the cell generally tapers, cp. the shape with 

 that seen in a. The stained nuclei are conspicuous. 



The preparation may be preserved by adding a drop 



