472 ESSAYS anv OBSERVATIONS 
4. Letter from Mr Marx M‘CaLium 20 
Grorce CLERK, E/q3 concerning. an unw 
ufual Motion of the Waters of the Frith of 
.' Forth at Queensferry, feven miles weft 
of Edinburgh, on the 1/2 of November 
17556 | 
vs SULRe 
se O the beft of my rememibrarice, ori 
a Saturday the firft of November, 'a- 
* bout ten 6’clock before noon, being then 
on the pier’at Queensferry, I obferved 
** the water torife very fuddenly, and re- 
‘turn again with the fame velocity about 
“a foot or eighteen inches perpendicular, 
‘as near as I ean remember; the*barks 
-* and boats then afloat ran forwards and 
“‘ backwards with great rapidity, and this 
“ continued for the fpace-of three or four 
“ minutes ; but, after the fecond or third 
‘“‘ rufh of the water, it gradually abated. 
** There was no wind at the time the wa= 
* ters were agitated as above.” 
5. An 
