Thinner preparations usually reveal more detail than thicker ones, 

 which justifies the small amount of practice reciuired to obtain good 

 mounts \vith living materials. With many tissues, cells may be obtained 

 by tapping the cut surface into a drop of fluid on a slide. Ciliated 

 epithelial cells from the lung of a mouse are readily isolated in this way, 

 providing a good teaching preparation as the beat of the cilia continues 

 for some time in mammalian Ringer's or Locke's solution. Smooth 

 muscle fibers isolated in 5% citric acid were examined by Magliozzi 

 (1948). Some investigators force tumor or other tissues through a 

 fine screen to break up the tissue and examine the resulting brie for 

 isolated cells or cell groups. The classical experiment of disrupting a 

 sponge and watching the reorganization might be repeated to advantage 

 with the phase microscope. Microorganisms may be shaken apart for 



