330 The Philippine Journal of Science 
PLATE 4 
Fie. 1. Pseudoreaction. Right forearm of F.A., Filipino, female, 12 years 
old. Injected 0.02 minimum lethal dose diphtheria toxin intra- 
cutaneously on December 18, 1919. Photograph taken twenty- 
eight hours after the injection. 
2. Pseudoreaction three days and eleven days after injection. B. M., 
Filipino, female, 24 years old. Right forearm injected with 0. 02 
minimum lethal dose unheated toxin. Left forearm injected on 
the outer side with the same amount of toxin heated to 75° C. 
for five minutes, and on the inner side with toxin heated to 
75° C. for ten minutes. Smaller marks are due to pigmentation 
(on site near the elbow on the right forearm and on the outer 
side on the left forearm), which remained after the first test 
October 17, 1921; larger marks on the farther side from the 
elbow on the right forearm and on the inner side on the left 
forearm produced by inflammation from the second test October 
25, 1921. Photographed on October 28, 1921. 
