24 
It naturally occurred to us to determine whether guinea pigs sensi- 
tized with injections of albuminous substances, such as are contained 
in milk, the white of eggs, peas, etc., are sensitive to subsequent 
injections of horse serum. 
The following experiments plainly indicate that animals sensitized 
with milk, egg albumen, peptone, or the albuminous substance 
extracted from peas, do not react when subsequently injected with 
horse serum. 
Other proteid substances versus horse serum. 
~So. 
G.P. 
First injecticn. 
Interral. 1 
Second injection. 
Eesnlt. 
705 
0.1 c. c. fresh, tvhole 
Days. 
31 
6 c. c. normal horse 
ISio symptoms. 
736 
milk, subcutaneously. 
do 
31 
(Xo. 15) serum, 
intraperitoneallv. 
‘ do 
Xo symptoms. 
738 
do 
31 
do 
Xo symptoms. 
703 
gm. peptone, sub- 
31 
do 
Xo symptoms. 
730 
cutaneously. 
1 c. c. egg albumen in 
21 
do 
Xo symptoms. 
731 
salt solution, subcu- 
taneously. 
do 
21 
do 
Xo symptoms. 
742 
1 c. c. watery extract 
21 
lOc.c. normal horse 
Xo symptoms. 
743 
peas, subcutaneously. 
0.5 c. c. watery extract 
21 
(No. 15) serum, 
intraperitoneallv. 
do 
Xo symptoms. 
744 
peas, subcutaneously. ' 
0.1 c. c. watery extract 
21 
do 
Xo symptoms. 
484 
peas, subcutaneously. 
1 c. c. normal horse 
' 64 
6 c. c. hemoglobin. 
Mild symptoms. 
485 
(roan) serum, subcu- 
taneously. 
6 c. c. normal horse 
64 
horse (roan), in- 
traperitoneally. 
do 
Mild symptoms. 
486 
(roan) serum, subcu- 
taneously. 
do 
64 
do 
Slight symptoms. 
487 
c. c. normal home 
64 
do 
Slight symptoms. 
(roan) serum, subcu- 
taneously. 
