: ILLUSTRATIONS 
[Photographs by E. Cortes.] 
PLATE 1 
Fic. 1. Typical Schick reaction, three days after injection, L.M., Filipino, 
female, 6 years old. Right arm (upper) injected with 0.02 
minimum lethal dose toxin and left arm (lower) injected with a 
. mixture of 0.02 minimum lethal dose toxin and 0.2 unit of anti- 
toxin. Photographed on January 17, 1920. 
2. The right arm of the case shown in fig. 1, thirteen days after 
the injection, showing especially the scaling after a positive 
Schick reaction. The injection was performed on January 14, 
1920, and the photograph was taken on January 27, 1920. 
PLATE 2 
Fic. 1. Bleb formation in Schick reaction, three days after injection, 
Above is J.M., Filipino, male, 11 years old and below is D.Y., 
Filipino, female, 14 years old. Photographed on October 20, 
1920. 
2. Pigmentation after bleb formation in Schick reaction. Same cases 
as fig. 1, three months after injection. Injected October 17, 
1919, and this photograph was taken on January 17, 1920. 
PLATE 3 
Fig. 1. Repeated Schick test. G.S., Filipino, male, 39 years old, photo- 
graphed on January 27, 1920. The dark area toward the elbow 
is the pigmentation that was left by a previous positive Schick 
test (October 9, 1919). The small dark area toward the wrist 
shows the appearance of the second reaction four days after the 
injection. 
2. Typical Schick reaction. C.G., Filipino, female, 37 years old. 
Right arm injected with 0.02 minimum lethal dose unheated toxin 
and left arm with 0.02 minimum lethal dose toxin heated to 75° C.- 
for five minutes the first time and ten minutes the second time. 
First test injected on October 17 and second test on October 25, 
1921. Photographed on October 28, 1921. Notice the pigmenta- 
tion (the site nearer the elbow) that remained eleven days 
after the first injection, and the beginning desquamation of the 
Skin (the site farther from the elbow) three days after the 
second injection. The control arm shows no marks whatever, 
after receiving toxin heated for five minutes in the first test 
and for ten minutes in the second test. is 
