58 NORMAL HISTOLOGY. 



the acid slowly injected until the organ becomes quite 

 tense ; the canula is then withdrawn, and the node 

 placed in strong alcohol. After a few days it will be hard 

 enough to make sections from. The sections, which 

 must be very thin, should be carefully shaken in a test- 

 tube, one third filled with water, to remove the lymph- 

 cells which lie in the meshes of the reticular tissue and 

 conceal it. As these cells are shaken out, the sections 

 look thinner, and when the operation is completed they 

 are stained with haematoxylin and mounted in glycerin. 



