22 



BACTERIOLOGY. 



burner to a tubular prolongation of the water 

 chamber. In a more recent model, as repre- 

 sented in Fig. 4, this 

 prolongation is dispensed 

 with, and the tempera- 

 ture is maintained by 

 means of a circular 

 burner which acts at the 

 same time as a funnel 

 ring. 



Glass Vessels. A 

 number of glass vessels 

 should be kept in stock 

 according to require- 

 ments. 



Bohemian hard glass 

 flasks are employed in 

 several sizes, for boil- 

 ing nutrient media. The 



FIG. 4. 



HOT-WATER FILTERING APPARATUS Conical forms are 6S- 

 WITH RING BURNER. . ,, , ^ 



pecially used in the 

 larger sizes for storing nutrient jelly. 



Glass funnels large and small are necessary, 

 not only in the processes of preparing nutrient 

 jelly, but for filtering solutions of aniline dyes 

 and for general purposes. 



A liberal supply of test-tubes should always be 

 kept in stock, as they are not only employed for 

 the tube-cultivations, but can be conveniently 

 used for storing bouillon, sterilised water, etc. 



