34 



CLINICAL BACTERIOLOGY AND HEMATOLOGY 



pared easily after a little practice, or may be bought from 

 R. B. Turner, ii, Foster Lane, E.G., at a moderate price. 



A Wright's blood capsule consists of a piece 

 of glass tubing which is drawn out straight to a 

 narrow point at one end, whilst the other, also 

 drawn out to a point, is curved round parallel 

 with the main tube in the shape of a L (Fig. 15). 

 To use it, proceed as follows : Prick the patient's 

 ear, or, if you prefer it, the finger (after the 

 application of a wide indiarubber band), and 

 squeeze out a large drop of blood. Place the 

 tip of the curved end of the pipette in this drop, 

 holding the pipette with the straight end point- 

 ing upward (Fig. 16), and you will find that the 

 blood will run rapidly into the curved tube by 

 capillary attraction ; continue to squeeze out 

 more blood and to suck it up until you have 

 collected as much as you want. It should be 

 quite easy to get the pipette half full. Then gently warm the 

 tapering portion of the straight end of the pipette in a spirit-lamp 

 or match-flame, and afterwards seal the tip (Fig. 17). As the air 



Fig. 15. (About 

 I full size, ) 



Fig. 16 



which is now imprisoned in the upper part of the pipette contracts 

 it will suck the blood from the curved limb into the body of the 

 pipette, which can be inverted and the blood shaken into the tip, 

 but take care not to do this until the glass is cold, as the serum loses 

 some of its properties when heated. If you are not going to 



