53 
FAMILY NO. 13. 
(Immune female; untreated male. ) 
Female (G. P. No. 110). February 8 to 20, 1906. One c. c. Daily subcutaneous 
injections 1 c. c. antitoxic horse serum (Natl. IX, 19). No symptoms. 
March 29, 1906. Six c. c. antitoxic horse serum (Natl. VIII, 18). Mild symp- 
toms. 
April 4* to 17, 1906. One c. c. daily injections antitoxic horse serum (Natl. IX, 
17). No symptoms. 
April 23, 1906. Six c. c. normal horse (roan) serum. Very slight symptoms. 
May 15, 1906. Ditto. Very slight symptoms. 
May 18 to June 27, 1906. One c. c. daily, same serum. No symptoms. 
September 7, 1906. Six c. c. normal horse (roan) serum, intraperitoneally. 
Very slight symptoms. 
Male (G. P. No. — ). June 8, 1906. Untreated. Put in cage after immunization o£ 
female was well advanced. 
Ofispring. August 10, 1906. One young born, and tested as follows: 
(G. P. No. 110a. ) September 7, 1906. 27 days old. Two c. c. normal horse (roan) 
serum intraperitoneally. Very slight symptoms. 
FAMILY NO. 14. 
(Immune female; untreated male.) 
Female (G. P. No. 426). September 7, 1906. Six c. c. normal horse (roan) serum, 
intraperitoneally. Slight symptoms. 
[Previous treatment: May 19 to June 27, 1906, 1 c. c. daily subcutaneous injec- 
tions of normal horse (roan) serum.] 
Male (G. P. No. 426m). June 8, 1906. Untreated. Put in cage during period of 
immunization of female. 
Offspring. July 24, 1906. Two young born, and tested as follows: 
(G. P. ISo. 426a.) September 7, 1906. 41 days old. Two c. c. normal horse 
(roan) serum, intraperitoneally. Slight symptoms. 
(G. P. No. 426b. ) Ditto. Slight symptoms. 
FAMILY NO. 15. 
(Immune female; untreated male. Exchange.) 
Female (G. P. No. 427). February 27, 1907. Six c. c. normal horse (roan) serum 
intraperitoneally. Severe symptoms. 
[Previous treatment: 245 days prior (May 18 to June 26) 1 c. c. normal horse 
(roan) serum subcutaneously daily.] No symptoms. 
Male (G. P. No. 42601). June 8, 1906. Normal. Put into cage during period of 
immunization of female. 
Offspring. January 22, 1907. Two young born. At once placed to nurse with 
untreated female. Tested as follows: 
(G. P. No. 427a.) February 27, 1907. 36 days old. Three c. c. normal horse 
(roan) serum intraperitoneally. Severe symptoms. 
(G. P. No. 427b.) Ditto. Dead, 62 minutes. 
Two young born of untreated female, but nursed with above female No. 427, 
tested as follows: 
(G. P. No. P. 108a.) February 27, 1907. 36 days old. Three c. c. normal 
horse (roan) serum intraperitoneally. No symptoms. 
(G. P. No. P. 108b.) Ditto. No symptoms. 
