288 The Increase in the Number of Erythrocytes with Altitude 
TABLE IV. 
Erythrocytes in 100,000's. First Count. 
© 
o 
o 
o" .j 
0 d 
i— I 3 
- 5 
■ S o 
CD ^3 
>-> O 
o o 
O CD 
*? 
to 
31—35 
1 
SO 
So 
■4- 
1 
1 
to 
51—55 
56—60 
61—65 
66—70 
71—75 
00 
1 
to 
81—85 
Totals 
4,6—50 
]_ 
5 
1 
7 
51—55 
3 
3 
4 
13 
56—60 
2 
4 
6 
1 
13 
61—65 
2 
1 
6 
7 
I 
17 
66—70 
2 
3 
4 
5 
4 
24 
71—75 
1 
1 
1 
2 
3 
1 
1 
10 
76 — SO 
1 
2 
3 
2 
1 
1 
10 
81—85 
1 
1 
1 
1 
4 
86—90 
I 
1 
2 
1 
6 
9 
5 
13 
24 
19 
12 
7 
1 
2 
1 
100 
r = 0-65 ±0-04. 
For a first count of 5,000,000 erythrocytes, what should be the expectation 
for a given second count taken 18 days later, at an altitude of 6000 feet ? 
G 2 = 6,500,000 + 0-65 x ^ (5,000,000—5,325,000), 
= 6,325,000 erythrocytes per c.mrn. 
The following table (Table V) gives the calculated and observed values. 
TABLE V. 
First Count 
Mean of 
Observed Second 
Counts 
Calculated Mean 
Second Count 
2,800,000 
4,800,000 
5,027,000 
3,300,000 
5,220,000 
5,322,000 
3,800,000 
5,800,000 
5,617,000 
4,300,000 
5,900,000 
5,912,000 
4,800,000 
6,220,000 
6.207,000 
5,300,000 
6,500.000 
6,502,000 
5,800,000 
7,090,000 
7,092,000 
6,300,000 
7,160,000 
7,387,000 
6,800,000 
7,800,000 
7,682,000 
7,300,000 
8,050,000 
7,977,000 
7,800,000 
8,300,000 
8,282,000 
And 
X 2 =-311. 
P=-998. 
Table VI shows the frequency distribution of 52 observations made on 
permanent Kasauli residents. They are few in number and widely varying. An 
average under such circumstances describes but poorly the character of the 
distribution. Still we may draw this conclusion from our inspection of the figures 
that the increase which we noted in the erythrocytes of individuals remaining at 
