NUTRIENT JELLY IN TEST-TUBES. 



77 



Another valuable formula is as follows : 

 Darby's fluid meat (peptonised), 

 Distilled water, 

 Gelatine, 

 Neutralise, and sterilise as above. 



I part. 

 100 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. 53.— Hot air chamber for sterilising glass, wadding, and other 

 apparatus. 



a. Hot air chamber containing test-tubes and flaslcs. 



b. Wire basket containing test-tubes to 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 



