ENDOTOXINS 43 



By retarding the cone in this way a drag is placed on the balls, 

 they slide to a certain extent over the inner surface of the pot and 

 exert a grinding action. 



See Hewlett's Serum Therapy, 1910 ; Hewlett, Proc. Ray. Soc., 

 B, 1909 and 1911 ; Proc. Roy. Soc. Med., vol. iii, 1909-10 (Patho- 

 logical Section), p. 165 ; Barnard and Hewlett, Proc. Roy. Soc., B., 

 1911. 



