198 A. J. J'Jtvart o.nd Noniian Tkomsoii : 



Jf tlje t-ross-iiHKulation weie successful, it Avuuld be interesting bo 

 see wlietlier the nudules I'loduced upon the infected plant were not 

 only tlie same externallv, i.e.. in .size and colour, as those on the 

 infecting plant, but also internally; whether the histology and 

 anatomy weie the same, the cells, the cork tissue, the vascular 

 bundles, the bacteria containing cells, etc., were identical in each. 

 If this were so, one would expect the bacteria in the iiodules pr(»- 

 duced uj^on the I'oots of clover inoculated witli acacia nodule 

 bacteria, the clover bacteria l)eing smaller than the latter, to be of 

 a similar size and sliape to the acacia l)acteria and ui similar 

 pliysi()]ogical ami liiological chai'actcrs. 



Actual i-fsulf" ill fohiilar forni. — The experiniejils weir tried 

 twice, extending over a ]>eriod of seven months, Novemljer. 11)11. in 

 June. i!)12. After sowing, the jilants were allowed varying periods 

 ()f growth before examinal ion . from seven weeks in the case of most 

 to four iiioiiths ill that of clovcr and lucerne 4)1 the Hist experiment. 



I'hotographs were taken of the live most forward plants in two 

 sei'ies. that uninoculated and the one inocidated with root nodide 

 liacteria from I'laf i/lohi iini six weeks after sowing. Although the 

 results show that no nodules were present on the roots of the 

 inoculated sei'ies of plants, yet they showed a more decidi'd growth, 

 and were larger and vstronger. Whethei' this was due to the root 

 nodule bacteria c(mtinuing to live in tin' soil and hx nitrogen 

 outside the 2:)lants they were unable to inferi. is an open ipiestion 

 i9<>:o Plate XIV.) 



The i-esiibs max l;e sliown ill the following table: — 



l.'oo'l- rTIiiEK'CFiES UKVELOPED AFTEK 1N0CUL.\T1()N WITH BACTERIA 

 TAKKN FROM NATIVE LEGUMES, AS UNDEK. 



The above table shows that of 80 different lots of plants that were 

 sown, on only two of these, clovers, were nodules found. The 

 uninoculated clover possessed many nodules, and microscopic 

 examination sliowed these to be i)acked with bactei-ia of the usual 

 kiml. It is jiossible that in this case and in the clover infected bv 



