196 



A. J. Ewari ami Norinan Thoinnon : 



assiiiiiptioii tliat tliey luiglit have l)oeii tavised by bacteria reiiiai)iiiig 

 nil tlie seed afte)" iiiefteetive sterilisation. BoiU-d water was usetl iu 

 all eases, and all jars and beakers were plaitil in boilin^ water 

 before use to ensure peifeet sterilisation and pure iiioruhition foi 

 each series. 



Ma/iner of Infeclinn am/ Soir/n;/. — T<_i infect the seeds, an in- 

 fusion in water was made of the contents of the nodules from eacli 

 of the chosen legumes. The ii(»dules were washed thoroughly in 

 sterilised water many times, no disinfecting agent being used for 

 fear of killing the bacteria; they were then cruslied u}> in water, 

 and the seeds before sowing were soa]\cd in tliis l)actcrial iiifusioii. 

 each series, of course, in its own inoculating mateiial. After 



FIG. I.— LIFK-SIZE DKAWINGS »>F NODUr.KS 



1. Platylobiiiin iioduk- 



2. Aotiis 



;i Hossiaea 



k .Acacia 



o. Swainsona 



'2-4 lain, x 1-2 iiiiu. Colour dark l>rowu, white 



towards one end. Oval sliapc. 

 H-20 mm. x 2-5 mm. Lii^ht brown colour. 



V^ery elouy;atcd, though rei^ular shape. 

 .")-l2 mm. X 2-t unu. Creamy brown, and re<4iilar 



oval shape. 

 (MO mm. X 4-5 mm. Liglit brown uuo end, white 



the other. Irregular rounded and oval. 

 3-20 mm. x 2-3 nun. Brown and white, and very 



irregular shape, somewhat clongafe. Many 



grouped in bunches. 



