46 
G. P. Xo. 4426: 
January 10, 1906, 0.002 c. c. toxine Xo, 5, subcutaneously. 
January 18, 1906, 6 c. c. normal horse (Xo. 15) serum, intraperitoneally. Xo 
symptom. 
February 14, 1906, 6 c. c. antitoxic horse serum (Xatl. VIII, 17), intraperito- 
neally. Symptoms (?). 
February 23, 1906, 6 c. c. antitoxic horse serum (Xatl. VIII, 17), intraperito- 
neally. Xo symptoms. 
March 29, 1908, 6 c. c. antitoxic horse serum (Xatl. VIII, 17), intraperitoneally. 
Mild symptoms. 
April 18, 1906, 6 c. c. antitoxic horse serum (Xatl. VIII, 18), intraperitoneally. 
Xo symptoms. 
May 16, 1906, 6 c. c. normal horse (roan) serum, intraperitoneally. Severe 
symptoms. 
May 18 to June 27, 1906, 1 c. c. normal horse (roan) serum, intraperitoneally, 
daily, except Sunday; 22 injections. Xo symptoms. 
January 25, 1907, 6 c. c. normal horse (Xo. 15) serum, intraperitoneally. Xo 
symptoms. 
March 26, 1907, 6 c. c. normal horse (roan) serum, intraperitoneally. Xo 
symptoms. 
For other instances of this variation of susceptibility see Part IX. 
pages 59 to 62, Bulletin 29, Hygienic Laboratory, United States Public 
Health and iMarine-Hospital Service. 
