THE FACTOR OF IMMUNIZATION 



195 







0' 



i 



Is 



ig 

 1^ 



l5 S ^< 



C^OO V^O <^0 rr^rO 





r o ^> ^ 



^ 



00 >^ <^ O 



O M O M 



on 



oooocooo 



+1 +1 +1 +1 § +1 +1 +1 



0\Tl-0\l-H U >-" t>I> 



cSMC^MroOO 



[A>^ mvo^^<^t1- 



Q 5^ 





ro (S m rq rq 



o o 



CO M Ti- M <0 



O tj O u 

 M rq M 



MV-iV-i»-i>-IkiI-i;^ "" 



^ ^' ^* ^" ^ <^ M M .S 



MMMMMfqMM Of) 





