384 071 the Frequency Distributions of Phagocytic Counts 
many distributions, including in each case never less than 400, and in the majority 
1000 cells. 
Having examined the results thus obtained, we shall give an illustration of the 
fitting of a curve to the means of samples, each of 25, drawn from a continuous 
count of 2000 cells, reserving a more complete study of this branch of the subject 
for a second memoir. Finally, we shall indicate the preliminary conclusions which 
may be drawn from our work. 
The material upon which our analysis is based is two-fold. 
As we mentioned above, Dr Strangeways allowed us to use all his data, and 
from this rich material we have obtained 8 sets of 1000 cells each, and one count 
of 2000. 
In addition, Dr Fleming, at the suggestion of Sir Almroth Wright*, who 
expressed his willingness to allow material from his laboratory to be submitted to 
statistical investigation, made for us six counts, the numbers of cells included 
varying from 400 to 1100. The frequency distributions are given in Table III. 
bis, and the means of the two sets of figures are as follows : — 
TABLE III. 
Observer 
Eeference 
Number of 
cells 
Mean 
Number of 
graph 
Strangeways 
I 
1000 
1-927 
1 
?T 
11 S. C. 
J) 
1-521 
2 
)T 
II c. & s. 
)5 
)? 
1-888 
3 
)) 
IV 
1-706 
4 
>) 
III 
)I 
2-014 
5 
)) 
V 
)) 
2-119 
6 
)) 
VII 
)) 
1-851 
7 
)? 
VI 
1-901 
8 
)) 
IV 
2000 
1-689 
9 
Fleming 
T. C. 
1000 
2-145 
10 
)i 
10 Norm. 
1010 
2-571 
11 
)> 
Norm. S. A. 
750 
3-040 
12 
)» 
No. 2 
800 
2-0825 
13 
)) 
T. A. 
1100 
3-729 
14 
51 
Norm. S. B. 
400 
3-005 
15 
A striking difference betweeii the S. and F. counts is the higher mean value 
found in all the latter. 
Owing to the greater ease of counting when but few bacilli are present in each 
cell, it was formerly recommended that an emulsion should be used which would 
give about 1-5 bacilli per cell as a mean when normal serum was employed. 
* We desire to express our gratitude to Sir Almroth Wright for allowing the counts to be made and 
to Dr Fleming for the care and labour entailed in making them. 
