﻿B 
  

  

  PIG. 
  169. 
  Cultures 
  of 
  peas 
  of 
  the 
  same 
  age 
  and 
  from 
  the 
  same 
  kind 
  of 
  seed, 
  

   one 
  (^1) 
  with 
  root-tubercle 
  bacteria 
  and 
  one 
  (B) 
  without. 
  After 
  Frank 
  

  

  207 
  

  

  