One of the drawbacks to opsonic index work is the large amount of very trying microscopic work required. Anything that would tend to reduce this time or the strain on the eyes would seem of value. Simon has proposed a technic according to which the percentage of phagocyting leucocytes is ascertained, no account being taken of the number of bacteria per leucocyte.
The following suggestion will apply whether the original technic of Wright and Douglas is used or Simon's, with slight adjustment to the particular case. When counting in determining the Wright index, one observes the number of bacteria in each of several leucocytes, carrying the separate numbers "in his head" until he has as many as he can carry, say five to ten; then he jots them down, thus: 1, 2, 0, 5, 0, 0, 1, 0, 4, 2, etc., and after a sufficient number has been counted, the