LULEÅ. 237 



in Upland, Sudermannia, Ostro-gothia, nor 

 Scania, though natives of Sraoland. 



In passing over a meadow towards the 

 water-side I heard somethhig snap and 

 crackle in the marshes, as if the water had 

 been boiling. In several places the latter 

 was dried up, so that mud only remained, 

 and these spots were almost entirely co- 

 vered with a kind of shell-fish which made 

 the above-mentioned noise. I observed 

 the same in several similar places, but in 

 others none were to be seen till I had stirred 

 up the mud, when it proved full of these 

 animals, which seemed to have made their 

 way deeper and deeper into the soil as the 

 water had withdrawn. The same sound 

 may be observed in a thousand places, ori- 

 ginally dry, when the water has access to 

 them, but I had never ascertained the cause 

 till now. (These shells seem to have been 

 the Mi/a arenaria, Faun. Suec.ii. 2127-) 



The Swammerdamia flies of Swam- 

 merdam and Lister were flying about here, 

 as numerous as atoms. I observed an in- 



