94 September 1748. 



Quartz, ; * they were quite fmooth and roundifh 

 on the outfide, and lay in a ftratum which was 

 a foot deep. Then the brick-coloured clay mix- 

 ed with fand appeared again. But the depth of 

 this ftratum could not be determined. Query, 

 Could the river formerly have reached to this 

 place and formed thefe ftrata ? 



MR. Bartram\&& not only frequently found 

 oyfter-fhells in the ground, but likewife met 

 with fuch {hells and fnails, as undoubtedly be- 

 long to the fea, at the diftance of a hundred and 

 -more Englijh miles from the fhore. He has 

 ven found them on the ridge of mountains 

 which feparate the Englijh plantations from the 

 habitations of the favages. Thefe mountains, 

 \vhich the Englijh call the blue mountains, are of 

 confiderable height, and extend in one continued 

 chain from north to fouth, or from Canada to 

 Carolina. Yet in fome places they have gaps, 

 which are as it were broke through, to afford a 

 paflage for the great rivers, which roll down into 

 'the lower country. 



THE Cajjia Chamacrifta grew on the roads 

 through the woods, and fometimes on unculti- 

 vated fields, efpecially when flirubs grew in 

 then* . Its leaves are like thofe of the Senfitive 

 flant, or Mimofa, and have likewife the quality 

 of contracting when touched, in common with 

 the leaves of the latter. 



* >uartz.um hfalinum, Linn. Syft. nat. 3. p. 65. 

 ^uartzum folidum pellucidum, Waller it Miner. 91. 

 Flat common Quartz, /V/far's Mineralogy, p. i^S. 

 'Quart&um coloratum y Linn. Syft. nat. 3. p. 65.' 



rfzum Jolidum opacum coloratum, Wall. Min. 9p. 



impure Quartz, Forft. Min, p. 16, 



THB 



