49 
FAMILY NO. 5. 
( Sensitized female ; untreated male. Exchange. ) 
Female (G. P. 2so. 614). March 26, 1907. Six c. c. normal horse (roan) serum 
intraperitoneally. Dead, 38 minutes. 
[Previous treatment; 309 days prior, 0.15 c. c. toxine No. 9+^io c. c. antitoxic 
horse serum (Natl. YIII, 18).] 
Male (G. P. No. 10). June 8, 1906. Untreated. Put in cage after female was 
sensitized. 
Offspring. February 17, 1907. Two young born, at once put to nurse with 
untreated female, and tested as follows: 
(G. P. No. 614a). March 26, 1907. 38 days old. Two c. c. normal horse (roan) 
serum intraperitoneally. Dead, 25 minutes. 
(G. P. No. 614b). Ditto. Dead, 20 minutes. 
Two young, born of untreated female and nursed with above sensitized female 
(614), tested as follows: 
(G. P. No. P-20). March 26, 1907. 38 days old. T^yo c. c. normal horse (roan) 
serum intraperitoneally. No symptoms. 
(G. P. No. P-20a). Ditto. No symptoms. 
GROUP B. 
FAMILY NO. 6. 
(Sensitized female; sensitized male. Exchange.) 
Female (G. P. No. 601). October 23, 1906. Six c. c. antitoxic horse serum (Natl. 
IX, 18) intraperitoneally. Dead, 15 minutes. 
[Previous treatment: 153 days prior, 0.15 c. c. toxine No. 9 + c. c. antitoxic 
horse serum (Natl. YIII, 18).] 
Male (G. P. No. 606x). Paired after both were sensitized. September 7, 1906. Six 
c. c. normal horse (roan) serum intraperitoneally. Dead, 17 minutes. 
[Pre^■ious treatment: 106 days prior, 0.15 c. c. toxine No. 9-f- gio c. c. antitoxic 
horse serum (Natl. YIII, 18).] 
Offspring. Two young, born August 28, 1906. Immediately nursed with an untreated 
female. 
(G. P. No. 601a.) October 23, 1906. 56 days old. Three c. c. antitoxic hor.se 
serum (Natl. IX, 18) intraperitoneally. Severe symptoms. 
(G. P. No. 601b. ) Ditto. Severe symptoms. 
Three untreated young pigs placed to nurse with the above mother (No. 601). 
(G. P. No. X.) October 23. 56 days old. Three c. c. antitoxic horse serum 
intraperitoneally. No symptoms. 
(G. P. No. Y. ) Ditto. No symptoms. 
(G. P. No. Z. ) Ditto. No symptoms. 
(G. P. mother of X, Y, and Z.) October 23. Six c. c. same serum intraperi- 
toneally. No symptoms. 
FAMILY NO. 7. 
(Sensitized female; sensitized male. Exchange.) 
Female (G. P. No. 603). February 27, 1907. Six c. c. normal horse (roan) serum 
intraperitoneally. Dead, 45 minutes. 
[Previous treatment: 282 days prior, 0.15 c. c. toxine No. 9-r?i^ c. c. antitoxic 
horse serum (Natl. YIII, 18).] 
