178 



PRACTICAL HISTOLOGY. 



blue solution (2 per cent.) is often employed, but the 

 best fluid for the purpose is a solution of alkanet in 



Fig. 30. 



Mercurial-pressure apparatus for injecting lymphatics. 



a, reservoir-bottle containing mercury ; b, pressure-bottle into which this tends 

 to flow; (?, injection bottle containing solution of Berlin blue, connected 

 with the pressure-bottle by one India-rubber tube, with the canula /by a 

 second, and with a small manometer by a third; d, handle of screw, by 

 turning which the stage on which the bottle a rests is raised or depressed, 

 and the pressure increased or diminished in b ; e, screw clip (opened); g, 

 spring clip (closed). 



turpentine, which readily flows into the lymphatics. 

 The canula can be made from a piece of glass tube 

 drawn out to a capillary point, but the best are long 

 perforated steel needles like those supplied with the 

 I'nivaz syringes, and as fine as it is possible to pro- 



