PRACTICAL BACTERIOLOGY. 



media, and small for filtering staining solutions. A 

 few quite small ones, about 2 cm. ia diameter, are 

 also required for filtering tlie staining solution direct 

 upon the cover-glass. 



11. Small glass benches, with their ends bent over, 

 upon which to stand cultures (Fig. 8). 



12. Test tubes, of at least 15 mm. in diameter and 

 15 cm. in length. For anaerobic cultivations longer 

 ones, and for Esmarch's tubes wider ones are required. 

 A considerable number of tubes are needed, and in 

 procuring them it is unwise to be too economical. 



13. Beakers. These are needed for various pur- 

 poses; I myself use them for boiling the nutrient 

 gelatine. It is also convenient to sterilise small glass 

 tubes, pipettes, etc., in beakers in the hot-air sterilising 

 apparatus. 



14. A wash-bottle of about 250 grms. capacity, 

 with a finely drawn out tube. 



15. Two graduated measures for measuring out the 

 quantity of water in preparing the nutrient media — 

 one of 1 litre in capacity divided into ten parts, and 

 another of 100 cm. divided into twenty parts. 



16. Measuring pipettes, several of 1 com. in capa- 

 city divided into tenths, and others of 2, 5, 10, 20, 25, 

 50, and 100 com. capacity. 



17. Glass dishes with double covers, for the so-called 

 plate cultures, of about 10 cm. diameter ; the lids 

 should fit as well as possible. 



