19 



can be conveniently handled in the bottoms of dry ditches. A strip 

 30 or 40 feet long will suffice. After this is stretched in the bottom 

 of the ditch the grasshoppers are driven from the sheet just as they 

 are driven into oiled ditches, and as soon as the distance of the length 

 of the strip is cleared the canvas is hauled forward and the drive again 

 made. This continued, the ditch banks may be as effectively cleaned 

 in dry weather as when the ditches are filled with water. 



The bran-arsenic mash. — The experience of Mr. Harding in 1899 

 (see his letter July, 1899) rather discouraged an extended effort with 



Fig. 5.— Hopperdozer : A, osnaburg back; B, pan; C, wooden ends of pan; D, runners; E, F, G, 



supports (original). 



this bait. Mr. Glenk, however, ventured a number of trials with the 

 mash and writes of it as follows: 



I placed the arsenic mash in many places with moderate success. Found a few 

 dead grasshoppers on the leaves and around the mash. The rain, however, inter- 

 rupted my experiments. 



The mash can not be relied upon in severe outbreaks, such as occurred 

 in the delta, but may be used in limited attacks where the area affected 

 would not warrant the more aggressive methods. 



The South African fungus. — On May 24 the following letter was 

 received from Dr. L. O. Howard, inclosing Mr. Edington's directions 

 for the culture and spread of the fungus, which are also herein given: 



May 22, 1900. 

 Dear Professor Morgan: In response to your letter I am sending you six of the 

 tubes of the South African locust fungus, together with a duplicate of a letter which I 

 have just sent to Mr. Harding, at Benoit. I think it will be advisable for you to 

 grow the fungus in the laboratory. Mr. Edington, director of the Bacteriological 

 Institute, writes me that it is best grown on saccharinated agar-agar, which is very 

 faintly acid in reaction. I hope you will report results. The South African circular 

 of instructions is inclosed. 

 Yours, very truly, 



L. O. Howard. 

 Prof. H. A. Morgan, Baton Rouge, La. 



