50 
Male (G. P. No. 606y) . June 8, 1906. Placed in cage with above female after both 
were sensitized. 
Offspring. January 17, 1907. Two young born, nursed with untreated female, and 
tested as follows: 
(G. P. No. 603a.) February 27, 1907. 41 days old. Two c. c. normal horse 
(roan) serum intraperitoneally. Marked symptoms. 
(G. P. No. 603b. ) Ditto. Very severe symptoms. 
Three young, born of untreated female and nursed with above sensitized female 
(603), tested as follows: 
(G. P. No. 66a.; February 27, 1907. 41 days old. Two c. e. normal horse 
(roan) serum intraperitoneally. No symptoms. 
(G. P. No. 66b. ) Ditto. No symptoms. 
(G. P. No. 66c.) Ditto. No symptoms. 
GROUP C. 
FAMILY NO. 8. 
(Immune female; immune male.) 
Female (G. P. No. 428). January 25, 1907. Six c. c. normal horse serum (horse 
No. 15) intraperitoneally. Slight symptoms. 
[Previous treatment: May 18 to June 27, 1906, 1 c. c. normal horse (roan) serum 
daily (except Sunday), subcutaneously, 22 injections.] 
Male (G. P. No. 4530). June 8, 1906. Immune. Placed in cage with above female. 
For history of this male see Family No. 14. 
Offsping-. December 28, 1906. Two young born and nursed with own mother. 
Tested as follows: 
(G. P. No. 428a.) January 25, 1907. 28 days old. Two c. c. normal horse 
serum (horse No. 15) intraperitoneally. Marked symptoms. 
(G. P. No. 428b.) Ditto. Marked symptoms. ' 
FAMILY NO. 9. 
(Immune female; immune male. Exchange.) 
Female (G. P. No. 4426). January 10, 1906. 0.002 c. c. toxine 7. Severe reaction, 
slough. 
January 18, 1906. Six c. c. normal horse serum (horse No. 15) intraperitoneally. 
No symptoms. 
February 14, 1906. Six c. c. antitoxic horse serum (Natl. VIII, 17) intraperi- 
toneally. Symptoms. 
February 23, 1906. Ditto. No symptoms. 
March 29, 1906. Ditto. Mild symptoms. 
April 18, 1906. Ditto (Natl. VIII, 18). No symptoms. 
]\Iay 16, 1906. Six c. c. normal (roan) horse serum intraperitoneally. Severe 
symptoms. 
May 18 to .lune 27, 1906. One c. c. normal horse (roan) serum subcutaneously 
daily (except SundajO, 22 injections. No symptoms. 
January 25, 1907. Six c. c. normal (No. 15). No symptoms. 
March 26, 1907. Six c. c. normal (roan). No symptoms. 
