48 
Male (G. P. Xo. 102). June 8, 1906. Untreated. Put in cage with above female 
after female was sensitized. 
Offspring’. August 21, 1906. Four young born. Two tested as follows: 
G. P. Xo. 610a. October 20. 59 days old. Three c. c. antitoxic horse serum 
(Xatl. IX, 17) intraperitoneally. Dead, 1 minutes. 
' (G. P. Xo. 610b.) Ditto. Dead, 60 minutes. 
FAMILY NO. 2. 
(Sensitized female; untreated male.) 
Female (G. P. Xo. 612). January 25, 1907. Six c. c. normal horse serum (horse 
Xo. 15) intraperitoneally. Very severe symptoms. 
[Previous treatment: 245 days prior, 0.15 c. c. toxine 9— c. antitoxic horse 
serum (Xatl. VIII, 18).] 
Male (untreated). June 8, 1906. Placed in cage with above female after she was 
sensitized. 
Offspring. One young born January 10, 1907, and tested as follows: 
(G. P. Xo. 612a.) January 25. 15 days old. Two c. c. horse serum (horse 
Xo. 15) intraperitoneally. Marked symptoms. 
FAMILY NO. 3. 
(Sensitized female; untreated male.) 
Female (G. P. Xo. 611). September 7, 1906. Six c. c. normal hoi'se serum (roan) 
intraperitoneally. Dead, 120 minutes. 
[Previous treatment: 106 days prior, received 0.15 c. c. toxine 9— 2To c. c. anti- 
toxic horse serum (Xatl. VIII, 18).] 
Male (untreated). Paired 17 days after treatment of female. 
Offspring. One young. Tested as follows: 
(G. P. Xo. 611a. ) Sej)tember 7, 1906. 2 days old. One c. c. normal horse serum- 
(roan) intraperitoneally. Dead, 20 minutes. 
FAMILY NO. 4. 
(Sensitized female; untreated male. Exchange. ) 
Female (G. P. Xo. 613). February 27, 1907. Six c. c. normal horse (roan) serum 
intraperitoneally. Very severe symptoms. 
[Previous treatment: 282 days prior 0.15 c. c. toxine O—oio c. e. antitoxic horse 
serum (Xatl. VIII, 18).] ' 
Male (G. P. Xo. lOx). June 8, 1906. Untreated. Put into cage 18 days after 
female was sensitized. 
Offspring. January 22, 1907. Two young born and at once put to nurse with 
untreated female. Tested as follows: 
(G. P. Xo. 613a.) February 27, 1907. 36 days old. Two c. c. normal (roan) 
horse serum intraperitoneally. Very severe symptoms. 
(G. P. Xo. 613b.) Ditto. Dead, 45 minutes. 
Two young, born of untreated female, put to nurse with above sensitized female 
(Xo. 613). Tested as follows: 
(G. P. Xo. P-68a.) February 27, 1907. 36 days old. Two c. c. normal horse 
(roan) serum intraperitoneally. Xo symptoms. 
(G. P. Xo. P-68b. ) Ditto. Xo symptoms. 
