496 



THE POPULAR SCIENCE MONTHLY. 



Fig. 1) show extremely limited growth." The plants in pots 2 and 

 3, inoculated with a soil-extract containing microbes, began to 

 show enhanced growth, when compared with the plants in pot 1, 

 before the end of July. Finally, the plants in pot 1 were eight 

 inches and a quarter, and eight inches and a half high ; in pot 2, 

 fourteen, and fifty inches and a half ; in pot 3, fifty-two inches and 

 a half, and fifty inches and a half ; while in the garden soil, in pot 



Fig. 3. Yellow Lupines. 



4, they made a somewhat less extended growth than those in pots 

 2 and 3 in a sterile sand inoculated with soil-microbes. It should 

 be remarked, however, that " the plants in pot 4 were more vig- 

 orous, and, while they flowered and seeded, neither of those in pots 

 .' or 3 did so." 



A photograph of the vetches was taken October 25th (a copy 

 of which is given in Fig. 2), and they were harvested for exami- 

 nation the following day. The plants in pot 9, which was not 

 inoculated with soil microbes, were eleven inches and a quarter, 

 and ten inches and a half high ; those in pot 10, in a sterile but 



