1893.] Bacteriology in its General Relations. 1065 
permanent immunity was therefore conferred by the mother. 
The temporary immunity can be explained on the assump- 
tion of the direct transmission of the anti-toxie substance to 
the young. , He continued the test by pairing animals that 
were descendants from the progeny of immunized ancestors, 
but in no case were the descendants refractory toward the 
toxie substance. "These results, although not conclusive upon 
the disputed question because not continued for a sufficient 
number of generations, are extremely interesting and go to 
show that the field of bacterial science offers wide and valuable 
opportunities for lines of investigation upon problems that 
have a general biological bearing. 
Allusion has been made, and thisin only the most cursory 
manner, to some of the more salient lines of work, and it 
requires no prophetie vision to see that an experimental field 
which is so suggestive in its infancy as this has proven to be, 
must in the future yield a rich harvest to patient systematic 
investigation. 
