93 



3. That the disease may be spread artificially when the weather con- 

 ditions are favorable, but that it is impossible to spread the disease 

 with any degree of success in a dry time, and especially upon high 

 ground. 



4. That the disease confines its attacks almost exclusively to two 

 species, Melanoplus bivittatus and ,1/. femur-ruhrum, so far as I have 

 been able to observe, and that it attacks these equally in all stages of 

 development. 



5. As I have seen occasional dead grasshoppers clinging to the tops 

 of plants in nearly every part of the State that J have visited, some of 

 these places at long distances from points of artificial introduction of 

 the disease, I believe it is probable that the disease is present in small 

 amount in most localities and that an artificial introduction will usually 

 do little or no good, though I should strongly advise the artificial 

 introduction of the disease in fields not having it, whenever possible. 



<>. That the unusual appearance of the disease last year was due 

 chiefly to the very extraordinary rainfall and the large number of 

 rainy days during June and July. 



A SIMPLE DEVICE FOR THE PREPARATION OF OIL EMULSIONS. 



By IT. A. Morgan. Ilciton Rouge, La. 



The fact that the ingredients which enter into a kerosene emulsion 

 are usually on hand, or may be easily procured at very little cost, 

 together with the general efficiency of a well-prepared emulsion as an 

 insecticide, recommends it at once to everyone, but the difficulty of 

 getting a thorough emulsion and the danger of using one improperly 

 prepared have had a tendency to offset the good qualities of which we 

 have just spoken and to cause oil emulsions to become unpopular. 

 This 1 have found to be the case with people who have only a few trees 

 or plants affected with insects and who are not prepared with force 

 pumps to be used to churn the emulsion. 



It is to accommodate those who have found it difficult to churn the 

 ingredients to a milk-like condition, and, too, to save the valves of the 

 force pumps, which I have found become materially impaired by forc- 

 ing the hot material through them, that I recommend the use of a 

 simple churn, which may be described as follows: 



The main portion consists of a tin cylinder 20 to 24 inches long and 

 4 inches in diameter; however, the diameter may be such that the 

 churn will conveniently fit into the opening of a knapsack sprayer, for 

 it may be often convenient to churn the ingredients within the sprayer. 

 Within an inch of the bottom of the cylinder is a row of seven small 

 openings (of course the number may vary, but in a 4-inch cylinder 

 seven, each with a diameter not more than three-eighths of an inch, Mill 

 be found sufficient). In the bottom of the cylinder there is in the figure 



