Philadelphia. 



THE Crows in this country are little different 

 from our common crows in Sweden. Their fize 

 is the fame with that of our crows, and they are 

 as black as jet in every part of their body. I faw 

 them flying to-day in great numbers together. 

 Their voice is not quite like that of our crows, 

 but has rather more of the cry of the rook, or 

 Linntzus's Corvus frugilegus. 



MR. Bar tram related, that, on his journies to 

 the northern Englijh colonies, he had diicovered 

 great holes in the mountains on the banks of 

 rivers, which, according to his defcription, muft 

 exactly have been fuch giants pots, * as are to be 

 met with in Sweden, and which I have defcribed 

 in a particular differtation read in the Royal Swe- 

 dijh Academy of Sciences. Mr. Bartram has 

 like wife addrefTed fome letters to the Royal So- 

 ciety at London upon this fubjsdt. For fome 

 people pretended that thefe holes were made by 

 the favages, that they might in time of war hide 

 their corn, and other valuable effefts in them. 

 But he wrote againfl this opinion, and accounted 

 for the origin of thefe cavities in the following 

 manner : When the ice fettles, many pebbles 

 ftick in it. In fpring, when the fnow melts, the 

 water in the rivers fwells fo high, that it reaches 

 above the place where thefe holes are now found 

 in the mountains. The ice therefore will of 

 courfe float as high. And then it often happens, 

 that the pebbles, which were contained in it ever , 



* IN Sweden, and in the north of Germany ^ the round holes in. 

 rivers, with a ftony or rocky bed, which the whirling of the wa- 

 ter has made, are called giants pots ; thefe holes are likewife men- 

 tioned in Mr. Grojlefs ntvj obfer^ations on Italy, Vol. i. p. 8. F. 



fmce 



