40 



THE MONTHLY BULLETIN. 



Fig. 22. — Potatoes showfng the work of the common nematode or potato eelworm. 

 The section shows the colonies of tlie eelworms in the tubers. (After Essig, Injurious 

 and Beneficial Insects of Cal., Supplement to the Mo. Bui. Cal. Hort. Comm., Vol. IV, 

 No. 4.) 



