PLASMODIOPHORA. 



521 



mentary condition and t\\i>ted course of tin.- vessels, and ;m 

 accumulation of transitory -taivh in the ti u^ 



[The methods at our disposal fur cuinl.atiii- this pai i-it<- all 

 work indirectly. Its spores seem t" retain their vitality for t\\u, 

 three, or more years, hence one very evident nuM-nn- i> nut tu 

 plant the same crop in succession un land whieh has I..M-II attaeki-.l. 

 -. however, all < 'rneiferae are liable tu injury from rhi- BOD 



Kni. :a , . n l"i nip. (After W mil. ) 



neither uuiild il lie advi-alile to !! Bay, inrnip- follow 

 calilia-'- or kohl ralii on infeetcd land. l-'or the same : 



ds lii'lo||"ill" to the order ( 'rileilel -Itld Hot 1-e ;dl"\\ed 



. 



to obtain a loolin- ne;u- land wh'-iv plant- lialde to i and 



toe" are under cult i\ at ion. In ><,,|laiid uhej,. turnip- are 



nece n\ in all crop-rotations, a foui year rotation doea not 



glVe eumph-le .i-lllplioll IVulll till- d ll"|- 1- !i\, 



