[HARRISON & BARLOW] NODULE ORGANIS.M OF THE LE( ;u:\IIXOSAE 22S 



30. Photo of botliom of flask of plant I, Vicia villosa, showing club shaped nod- 

 ules on the roots, (enlarged). 



37. Photo of bottom of flask of plant I, Vicia villosa, showing moderate growth 

 of roots, which are smooth except for the nodules. Largest nodules 8 x 

 2 m.m after 4 months' growth. 



