PLATE lo 



Tubers inoculated with Ftcsariwrn oxyspomm and kept for five weeks at the fol- 

 lowing temperatures and humidities: 

 A. — 12.5° C, 70 per cent relative humidity. 

 B. — 12.5° C, 100 per cent relative humidity. 

 C. — 25° C, 10 per cent relative humidity. 



(80) 



