204 



BAZIN'S CAPILLARY CHORESIMETER 



can further be formed of the number of elements containd in the 

 drop. In the same way 2)arasitic organisms and leucocytes can be 

 counted. 



The reseau also serves as a reference system of co-ordinates, and 

 can replace the pointer of the eye-piece. (The device was described 

 in the Bulletin de la Soclett cle Pathologic Exotique, Vol. XII., 

 p. 135, 1919.) 



Fig. 2. 



BAZIN'S CAPILLARY CHORESIMETER. 



The haematocrite makes use of centrifugal force for the purpose 

 of counting the? number of blood globules. With a similar apparatus 

 bacteria suspended in distilled water can be counted ; their small 

 size calls for a special device, however, 



A glass flask, of a capacity of 20 cub. cm., is terminated by 

 a capillary tube, 0.2 mm. bore, 4 cm. long: The extremity of the 

 tube is closed by a rubber disc kept in position by a stirrup which 

 can be turned about its axis (see Fig. 3). The stirrup is supported 

 by a metal collar encircling the neck of the flask. The upper 

 aperture of the flask is hermetically closed by a metal stopper, which 

 is provided with a rubber packing and screwed into the collar. 

 To prevent any slipping of the stirrup during the centrifugation, 

 the capillary tube, to«:ether with the stirrup, is enclosed in a sleeve 

 of copper or brass. The capillary tube is filled with distilled water, 

 the rubber disc is applied to its lower end, and the stirrup turned 

 down. The bacteria suspension is poured into the flask, the stopper 

 screwed in, and the sleeve mounted. The apparatus is then placed 

 in the container of the centrifugal machine, which is turned for ten 

 minutes at 7,000 revolutions. The bacteria collect in the capillary 



