INTRODUCTION. 



18. Glass shades with glass knobs, of about 22-24 

 cm. in diameter, and 5-6 cm. in height. These 

 are made use of as moist chambers for potato cultiva- 

 tions, etc. (Fig. 1). 



19. Porcelain dishes of about 5 cm. in diameter for 

 heating staining solutions, and one larger one which 

 is used for heating the nutrient agar-agar in the salt 

 water bath. 



20. A Kipp's apparatus for the preparation of hy- 

 drogen for anaerobic cultivations is not indispensable. 

 In case of need, hydrogen can be prepared in a simple 

 gas generating flask, although of course the operations 

 cannot be as accurately carried on as if a Kipp's 

 apparatus is used. A small apparatus costs about 

 10s., and is to be strongly recommended. 



21. Thermometer. This need only indicate up to 

 150° 0. A thermometer with a long stem divided 

 into tenths of degrees, indicating up to 50° C, is very 

 convenient for use in the incubator. 



22. A Reichert's thermo-regulator* is necessary for 

 cultivations of tubercle bacilli, if gas is used, and if 

 the incubator is good. 



23. Gas burners with one and four flames, the latter 

 for the hot air steriliser and the steam steriliser. The 

 ones most to be recommended are those of Desaga 



* Page'd tliermo-regulator is, in some respects, more con- 

 veiiieat. 



