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reaching the state, it was soon lost after their arrival. It is not 

 easy to trace them, even from one county to another, as they 

 passed over ground already occupied by earlier comers. All we can 

 say is, that there were extensive movements in certain directions, 

 on certain days. 



MOVEMENT OF SWARMS WITHIN THE STATE. 



The movement of the various swarms of our own hatching 

 early in the season has been already given. By the 10th of July 

 the counties to the south of the Minnesota river were generally 

 free from locust, and had begun to congratulate themselves on 

 their delivery. Between the 10th and the 20th the locusts had 

 begun to increase largely in numbers in the northern counti^, but 

 the fact that additions had already begun from abroad was not 

 generally known. The greater portion of these had begun to 

 move southward by the latter date and passed various points 

 between Lac qui Parle and Madelia on or soon after July 20th. 

 They passed gradually along over the counties that had been 

 injured during the spring by our own stock of locusts, and by the 

 first of August had reached the southern line of the state and 

 many had passed on into Iowa. As they moved along, portions 

 remained behind here and there, but there was no extensive de- 

 posit of eggs until they reached the southern half of the lower 

 range of counties in the state. It seems probable that these 

 bodies also brought with them to the southward, parts of our own 

 hatching swarms that had flown northward early in the month. 

 Hut by the twentieth of the month the locusts had mostly dis- 

 appeared from along the lines of the Saint Paul and Pacific, and 

 the Saint Paul and Sioux City Railroads, and there were congrat- 

 ulations once more that "the hoppers were gone." A line 

 showing the eastern limit of their raids at this date would pass, 

 generally speaking, along the eastern boundary of Todd county, 

 through Stearns, Meeker, the eastern part of McLeod, through 

 Sibley, Nicollet, and the northwest corner of Blue Earth, and in. 

 Martin county as far east as Faribault. 



Between the end of July and the sixth of August, new swarms 

 had been collecting in Otter Tail, Grant, Stevens, and Big Stone 

 counties, and in some of the eastern counties of Dakota ; and on 

 the latter date, a wind from the northwest gave these an oppor- 

 tunity they had apparently been waiting for, and there was a 

 general flying to the east and southeast, over a large portion of 

 the western half of the state. In the southwestern counties, 



