Science Record

ee

Table 1

41

Frequency of times of survival of mice after intravenous injection with 0.4mg

of tubercle bacilli exposed to cosmic radiation.

SS ae ee aa ea SS en est | Se ce oe

Group la | 1b | 1c | 2

3 4 5

6

7

| 8 9 | 10

als

Screen cm Pb.

0 0 0

Control 1.1

Dl 3s2h |) 452

5.3

6.3

Tet || 955 | 10.5

12 3 2 13 14 15 16 17 18 19 20 21 22 23 24 1 25

26

34

NH Why UF WN FE BN WwW FW PN © WN nN eu NY YY WN Ff WN

Ww bt

BN AN WF FPrPWN

Rr WH Fr WwW

Rp

BPh Wa WN WN

T, times of survival in days after infection.

Table 2

Analysis of variance of groups la, 1b, Ic, 2, 4, 5, 6, 7 and 10.

Source of variation Sum of squares Total 1 470.50 Treatments 327.89

Error 1 142.61

177 6 171

Degrees of freedom

Mean square F 54.65 8.18 6.68

Mean of pooled controls =17.0 days. Significant difference between two means =1.7 days, P =0.01 and 2,2 days for P=0.001. Groups 4, 5, 6, 7 and 10 all show a highly significant. difference when compared with the control. :