52 
Offspring. Three young, born December 29, 1906, and nursed with untreated G. P. 
Xo. P. 50. Tested as follows; 
(G. P. Xo. 429a.) January 25, 1907. 27 days old. Two c. c. normal horse 
serum (horse Xo. 15) intraperitoneally. Jlarked symptoms. 
(G. P. Xo. 429b.) Ditto. Marked symptoms. 
(G. P. Xo. 429c. ) Ditto. Marked symptoms. 
Two young of untreated G. P. Xo. P. 50 nursed with immune female Xo. 429, 
and tested as follows : 
(G. P. Xo. P. 50a.) January 25, 1907. 27 days old. Two c. c. normal horse 
serum (horse Xo. 15) intraperitoneally. Xo symptoms. 
(G. P. Xo. P. 50b.) Ditto. Xo symptoms. 
GROUP D. 
FA^tlLY NO. 11. 
(Immune female; untreated male.) 
Female (G. P. Xo. 410). January 15, 1906. One c. c. antitoxic horse serum 
(Xatl. VIII, 17). Xo symptoms. 
January 23, 1906. Ditto. Xo symptoms. 
February 8, 1906. Six c. c. same serum. Xo symptoms. 
February 14, 1906. Ditto. Xo symptoms. 
February 23, 1906. Ditto. Xo symptoms. 
JIarch 29, 1906. Six c. c. antitoxic horse serum (Xatl. VIII, IS). Xo 
symptoms. 
April 18, 1906. Ditto. Xo symptoms. 
May 16, 1906. Six c. c. normal horse (roan) serum. Xo symptoms. 
iMay 13 to June 27, 1906, daily. One c. c. same serum. Xo symptoms. 
September 7, 1906. Six c. c. normal horse (roan) serum intraperitoneally. Xo 
symptoms. 
All injections subcutaneously. 
Male (G. P. Xo. 410m). June 8, 1906. Untreated. Put in cage after female was 
immunized. 
Offspring. July 20, 1906. Three young born, and tested as follows: 
(G. P. Xo. 410a.) September 7, 1906. 18 days old. Two c. c. normal horse 
(roan) serum intraperitoneally. Xo symptoms. 
(G. P. Xo. 410b. ) Ditto. Xo symptoms. 
(G. P. Xo. 410c. ) Ditto. Xo symptoms. 
FAMILY NO. 12. 
(Immune female; untreated male.) 
Female (G. P. Xo. 430). February 27, 1907. Six c. c. normal horse (roan) serum 
intraperitoneally. Severe symptoms. 
[Previous treatment: 245 days prior (May 18 to June 27). One c. c. normal 
horse (roan) serum subcutaneously daily.] 
Male (G. P. Xo. — ). June 8, 1906. Untreated. Put in cage during perio«i of 
immunization. 
Offspring. January 22, 1907. Two young born and nursed with mother. Tested 
as follows: 
(G. P. Xo. 430a). February 27, 1907. 36 days old. Two c. c. normal horse 
(roan) serum intraperitoneally. Marked symptoms. 
(G. P. Xo. 430b.) Ditto. Marked symptoms. 
(G. P. Xo. 430c.) Ditto. Mild symptoms. 
