9 



ESSENTIALS OF BACTERIOLOGY 



In this work the following special apparatus are required : 



1. A Wright's tube for collecting the blood. 



2. Four c.c. test-tubes 7 cm. long and 9 mm. in diameter, 

 to hold the washed leukocytes. 



Fig. 48. Tubes utilized in testing agglutinating and sedimenting proper- 

 ties of serum: a, Leukocyte meter pipet; b, V-shaped tube; c, capillary pipet; 

 d, Wright's sedimentation tube. 



3. Suction pipets, either Gowers' graduated pipet, as used 

 in blood examinations, or a special device of Wright's (see 

 d, Fig. 48). 



