284 The Increase in the Number of Erythrocytes with Altitude 
extending to 8,500,000 per c.mm. The mean of the distribution is 5,300,000 
erythrocytes per c.mm. with a probable error of + 67,000 and a standard deviation 
of 1,127,000. These counts include all individuals, whether suffering from anaemia, 
enlarged spleens or helminthic diseases and also persons coming from high altitudes 
as well as those in whom none of these characters are present. They were in fact 
a random sample of the Pasteur Institute population. In every case, in order 
to avoid being influenced by the count itself, these points (anaemia, etc.) were 
carefully noted beforehand and recorded. 
TABLE II. 
Showing the Frequency of the Total First Counts. 
Number of 
Erythrocytes 
Frequency 
in 100,000's 
27 
1 
28 
0 
29 
1 
30 
2 
31 
0 
32 
2 
33 
1 
34 
2 
35 
I 
36 
0 
37 
1 
38 
3 
39 
3 
40 
2 
4 
m 
2 
43 
1 
44 
0 
45 
2 
46 
6 
47 
0 
48 
4 
49 
3 
50 
6 
51 
6 
52 
8 
53 
4 
54 
12 
55 
3 
56 
2 
57 
6 
58 
5 
Number of 
Erythrocytes 
in 100,000's 
59 
60 
61 
62 
63 
64 
65 
66 
67 
68 
69 
70 
71 
72 
73 
74 
75 
76 
77 
78 
79 
80 
81 
82 
83 
84 
85 
Total 
Mean 
S. D. 
Frequency 
130 
53+ -67 
11-3 
Now if we eliminate from the total the persons suffering from anaemia and 
enlarged spleens and those who have come from high altitudes, we are left with 
the distribution shown in Table III and Fig. 4. The total number now consists 
of only 75 individuals. 
