PLATE 6 
A. —Detail of tlie door construction of the improved field cage shown in Plate 5, A. 
The method of overlapping the cloth on one side, thereby avoiding the necessity of 
sewing the edges, should be noted. The writers are indebted to Mr. J. B. Norton, of 
the Bureau of Plant Industry, for suggestions relative to the construction of the door. 
(Original.) 
B. —Cloth-covered wire cages, together with a large lantern globe, representative of 
the types of cage used for greenhouse experiments and for individual inoculations in 
the field cages. (Original.) 
