NUTRIENT JELLY IN TEST-TUBES. 



Another valuable formula is as follows : — 

 Darby's fluid meat (peptonised), 

 Distilled water, .... 



Gelatine, ..... 



Neutralise, and sterilise as above. 



77 



i part, 

 ioo parts. 

 5 parts. 



Methods of employing Sterile Nutrient Jelly. 



(A.) In Test- Tubes. 



44. The test-tubes are first prepared by thorough cleansing, and then 

 plugged with firm cotton wool plugs, and heated for an hour to 170 C, 



Fig. 33.— Hot air chamber for sterilising glass, wadding, and other 

 apparatus. 



a, Hot air chamber containing test-tubes and flasks. 



b. Wire basket containing test'tubes 10 be sterilised. 



When hung upon a wall, a sheet of asbestos should intervene be- 

 tween the apparatus and the wall. 



in the dry air steriliser (see Fig. 33). When cool, they are ready 



