pneumoniac

In the foregoing illustration it has been assumed that complete acquired active immunity has been conferred upon the experimental rabbit in consequence of the formation of antibody, specific to the diplococcus pneumoniac, sufficient in amount to ensure the destruction of enormous doses of the living cocci -- the _antigen_ (that is the substance injected in response to which _antibody_ has been elaborated) in this particular case being the bacterial protoplasm of the pneumococcus with its endo-toxins.

The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged.