252 
On Theories of Association 
TABLE XXI. Severity of Attack and Strength of Immunity due to 
Vaccination City of Glasgoio Hospital. 
Seventy of Attack. 
2 
'o 
o 
!> 
CD I 
03 
■— 
o 
Haemorrhagic 
Confluent 
Abundant 
Sparse 
Very Sparse 
Totals 
0—10 
0 
1 
6 
11 
12 
30 
10—35 
5 
37 
114 
165 
136 
457 
25—Jf5 
29 
155 
299 
268 
181 
932 
Over 45 
11 
35 
48 
33 
28 
155 
Unvaccinated 
4 
61 
41 
' 
2 
115 
Totals 
49 
289 
508 
484 
359 
1689 
Diagram XI. Regression of the intensity of vaccination upon severity of attack and of severity of attack upon 
intensity of vaccination, showing the continuity of the relationship. Measured on Gaussian scales. 
10-25 
s 
-a 
s 
25-45 — 
Un\ hc- 
cirmted 
Haemorrhagic. Confluent. Abundant. Sparse. 
Severity of Attack. 
Very Sparse. 
