Petrefaclion found at Eaft Lothian. 43 
parallelograms next the wooden pipe (inftead of conti- 
nuing as ftraight lines) formed in that place very bold 
femi-circular curves, or protuberances, one beyond ano- 
ther, projecting from the wooden pipe inwards; and this 
curvilinear projection was uniformly continued through- 
out all the fimilar parallelograms quite to the inward 
cavity of the pipe formed by the incruftation, and there at 
I aft occaftoned a projecting gibbofity, of a confiderable 
extent every way, from the point of the naif'C 
Having mentioned thefe remarkable faCts to my very 
learned and ingenious friend Dr. fothergill, I had the 
pleafure to find they ftruck him much in the fame light 
in which they had appeared to me; and that he, more- 
over, formed the fame conclulion concerning the fpeci- 
men now laid before the Society that you had alfo formed 
and mentioned in the note you favoured me with when 
you lent the fpecimen to my houfe; namely, that the 
concretion was effected by the folution of the adjoining 
iron ring. 
Dr. fothergill alfo (who had communicated fome 
very original conjectures upon this fubject to the So- 
ciety many years ago) informed me of fome further 
(e) There is another fragment of the irtcruflation formed within this pipe* 
with a tranfverfe feftion thereof polifhed, in the Mufeum of the Royal Society; 
but that with the point of the nail, which is here alluded to, is ftill in my 
pofleffion. 
(f) In a paper on the Origin of Amber, read in the year 1743. 
G 2 
curious 
