178 LABORATORY GUIDE IN BACTERIOLOGY 



SECTION 9 



GROWING LEGUMES IN SAND AND IN SAND INOCU- 

 LATED WITH TUBERCLE BACTERIA 



Secure some flower pots and fill them with sand. 

 Plant some species of legume and soak the sand in half 

 the number of pots with suspensions of legume bacteria. 

 The difference in growth between those planted in pure 

 sand and those planted in inoculated sand will be evi- 

 dent after a short time. 



