[ 53 ] 
Queen Elizabeths and which, to my Knowlege, is 
too much praftifed lince by unworthy Perfons. 
It is likely, that many of the coralline Subftances 
mention'd by Authors, may be this, or Parts of it, 
the Cruft being rubb'd off more or lefs, and its Co- 
lour changed, and thereby defcribed for different 
Corallines. 
X. ExtraSls of Two Letters from the Reverend 
Henry Miles, D. D. & F. R. S. to Mr. 
Henry Baker, F. R. S. containing fever al 
Ele&rical Experiments. 
Read Feb 
1 745" 6, 
I. 
*Dear Sir, 
AM under no Doubt, but that Experi- 
J [ ments with Sulphur are capable of 
being improv'd, and hope fhortly to make is appear. 
I am loth to venture my glafs Tubes of Flint for a 
Mould, but intend to procure one of common Glafs? 
having lately had the Misfortune of lofing my befty 
in fo odd a Manner, that I believe you will excufe 
me if I trouble you with the Account. 
I had been ufing it but a little Time in the Even- 
ing; and, before I laid it up, having by me a round 
Ruler fmall enough to go into the Bore, when it 
was cover'd with a Roll or two of brown Paper, 
it came into my Head to excite it, by rubbing it a 
little on the Infide with the faid Ruler and Paper ; but 
not finding any Eff eft of it, after a few Minutes 
Trial, not fo much as to attract the fmalleft Thread, 
I laid it in my Window in my Study on a Parcel of 
5 Papers 
