28 Nebraska Agricultural Exp . Station , Research Bui. 21 
Table 38. 
Length of surviving periods of animals which were serum-virus 
treated and which died as a result of a second virus infec- 
tion. 
Approximate averages of surviving periods by doses 
and in hours 
Serum No. 
15 
c.c. 
10 c.c. 
5 c.c. 
All doses 
No. of 
Sur- 
No. of 
Sur- 
No. of 
Sur- 
No. of Sur- 
rab- 
viving 
rab- 
viving 
rab- 
viving 
rab- ; viving 
bits 
periods 
bits 
periods 
bits 
periods 
bits periods 
1053 
3 
32 
3 
32 
2 
24 
8 30 
1433 
— 
— 
1 
24 
1 — 
1 ! 24 
1436 
1 
24 
2 
24 
1 
24 
4 24 
1946 
2 
24 
2 
24 
3 
24 
7 ! 24 
Totals 
and averages . . 
6 
28 
8 
27 
6 
i 
24 
20 ; 26.4 
Virus controls 
— 
— 
— 
i | 
8 
24 
In the second part of the experiment with the swine strain 
sera, all experimental animals received a uniform amount (10 
c.c.) of serum and were then divided into groups of which each 
received a virulent inoculation at periods some three or four 
days apart. The details of the tests are exhibited in Tables 
39-44. 
