FOOD SUPPLY 



61 



has been most readily accomplished in the extensive ship- 

 ments of such products. The Orient is represented by several 

 Chinese bean-weevils which affect the stored seeds of legumi- 

 nous plants; southern Europe by the Mediterranean flour 



FIG. 29. Diagram illustrating the various combinations in which several arsenical insecticides may be 

 combined with contact insecticides and fungicides for the protection of certain orchard fruits from in- 

 sects and fungous diseases. In the figure, the sections between the heavy black lines represent the com- 

 binations suitable with three different arsenicals, while the smaller sectors represent suitable treatment 

 for several types of injury to the particular plants that are indicated about the periphery of the diagram. 

 (Slightly modified from Quaintance.) 



moth, Mexico by the Mexican grain beetle, etc., while the 

 majority of the more common ones are so widely scattered 

 that it is almost impossible to ascertain their original home. 

 Owing to the non-living character of the material in which 

 these insects live, it is possible easily to control them by 

 means of simple physical or chemical means such as heating 



