CHAPTER II 



PREPARATION OF CULTURE MATERIAL 



Artificial cultivations of micro-organisms in suitable 

 nourishing media in the incubator (Figs, i and 2) at tem- 



FiG. I.— Incubator, with Page's Regulatok. 

 A. Page'b Regulator. — This consists of a tube filled with mercury, and immersed 

 in the water surrounding the chamber of the incubator. In the upper part of the 

 tube, above the mercurial column, is a fine open glas-s tube, having near the lower 



