170 Dr. Wright and Capt. Douglas. Action on [July 26, 



Observation 3. 



A. 



Scrum of mother No. 3 2 vols. 



J. F.'s washed corpuscles 



Suspension of heated tubercle bacilli 1 vol. 



Phagocytic index (average of 40 P.W.B.C.), 3-55. 



B. 



Serum of child No. 3 2 vols. 



J. F.'s washed corpuscles 



Suspension of heated tubercle bacilli 1 vol. 



Phagocytic index (average of 40 P.W.B.C.), 1'85. 



Observation 4. 



A. 



Serum of mother No. 4 2 vols. 



A. E. W.'s washed corpuscles 2 



Suspension of heated tubercle bacilli 1 vol. 



Phagocytic index '(average of 31 P.W.B.C.), 17'9. 



B. 



Serum of infant No. 4 2 vols. 



A. E. W.'s washed corpuscles 2 ,, 



Suspension of heated tubercle bacilli 1 vol. 



Phagocytic index (average of 30 P.W.B.C.), 10. 



Observation 5. 

 A. 



Serum of mother No. 4 agglutinates a suspension of frag- 

 ments of tubercle bacilli completely in dilutions of 1 in 

 2, 4, 8, and 16 ; incompletely in a dilution of 1 in 32. 



B. 



Serum of infant No. 4 agglutinates the same suspension 

 completely in dilutions of 1 in 2 and 1 in 4 ; incompletely 

 dilutions of I in 8 and 1 in 16. 



V. On some points in connection ivith the Elaboration l>y the Human Organism 

 of T liber culotr&pic Elements in response to Inoculations of a Tubercle 

 Vaccine. 



We propose to set down here in briefest outline the more important 

 of the facts which have emerged in the course of a study of the blood 

 changes elicited by inoculations of a tubercle vaccine undertaken for 

 therapeutic purposes. 



Natare of tJie Tubercle Vaccine employed. A tubercle vaccine may be 

 defined, with respect to its derivation and its effect upon the organism, 

 as any derivative of the protoplasm of the tubercle bacillus, which is 





