18 
that illustrated in fig. 4. It consists of six attached strips of osnaburg 
6 feet long, with light poles attached to the ends. The sheet was kept 
moist with coal tar and was dragged by a mule along all the ditch 
banks and even down in the ditches where this was possible. Several 
of these sheets were made and kept actively at work while the grass- 
hoppers were young, and great numbers of the insects were thus 
collected. While these sheets possess the merit of not breaking the 
young corn and cotton and of catching myriads of the grasshoppers, 
it is to be regretted that they soon wore out when dragged over culti- 
tivated areas. 
The hopperdozer, which was finally constructed and which possessed 
Fig. 4.—Patterson tarred sheet,: a, strip of wood supporting sheet; b, strip of osnaburg; c, guide rope; 
d, hitch rope (original). 
much merit when run diagonally over the rows of cotton and corn, 
consisted of three runners 3 inches high and 2 feet long, a pan of cor- 
rugated or sheet iron, and a back of osnaburg. (See fig. 5.) 
Two more contrivances for catching young grasshoppers are to be 
recommended. These are of value during dry weather when it is 
impossible to hold the rain water in the ditches, or to fill them from 
the river or neighboring bayous by irrigating pumps. One is a hop- 
perdozer sufticiently narrow to run in plantation ditches and light 
enough to be handled by a man upon the sloping ditch banks. They 
will prove serviceable, too, upon limited egg areas when the young 
are emerging. The other is a tarred strip of osnaburg just as long as 
