24 July 1749. 



but has a number of fmall pores, which ex- 

 ternally appear to be covered with a pale 

 grey cruft. They are from an inch to an 

 inch and a half in diameter. 



AMONGST fome other kinds of fand, 

 which are found on the mores of lake 

 Champlain, two were very peculiar, and 

 commonly lay in the fame place ; the one 

 was black, and the other reddifh brown, 

 or granite coloured. 



THE black fand always lies uppermoft, 

 confifts of very fine grains, which, when 

 examined by a microfcope, appear to have a 

 dark blue colour, like that of a fmooth 

 iron, not attacked by ruft. Some grains 

 are roundim, but moft of them angular, 

 with mining furfaces ; and they fparkle 

 when the fun mines. All the grains of 

 this fand without exception are attracted 

 by the magnet. Amongft thefe black or 

 deep blue grains, they meet with a few 

 grains of a red or garnet coloured fand, which 

 is the fame with the red fand which lies 

 immediately under it, and which I {hall 

 now defcribe. This red or garnet coloured 

 fand is very fine, but not fo fine as the 

 black fand. Its grains not only participate 

 of the colour of garnets, but they are really 

 pothing but pounded garnets. Some grains 

 are round, others angulated 5 a]l mine anci 



