f M ) 
Thefc Confidentions made me conjecture that 
which I take to be a Mineral OkoCiim ccas.u1:uecl 
with a Mineral Volatile Acid, might be a Natural i^hof- 
phorf^s, fo I fell to make many Experiments upon ir, 
^and at laft found, that by gently rubbing a well po- 
liQi’d Piece of Amber with my Hand in the dark, which' 
was the Head of my Cane, k produc’d a Eighty wh?re- 
upon I got a pretty large piece of Amiber, which I cat7- 
fed to be made long and taper, and drawing it gently 
thro’ my Hand, being very dry, it afforded a conlidcra" ■ 
ble Light. I then us'd many Kinds of foft Animal Sub- 
ilances,and fcijiid none did fo well as that of Wool, And 
now new offered themfelvcs f, for upon draw-' 
ing the piece of Amber fwifdy thro’ the Woollen Cloth, 
andfqueczing it pret'y hard with my Hand, a prodigious 
number of liule Cracklings were heard, and every one 
of thofe produc’d a little fl ;Qi of Light *, but when the- 
Amber was drawn gently and H'ightly thro’ the Cloath, it 
prodiK^’d a Light but no Crackling:^ but by holding one’s - 
Finger at a liitic dihance from the Amber, a large Crack- 
ling is produc’d, with a great llalb of Light fuccecuing ir, 
and, what to me is very furprizing, upon its eruption it 
ffrikes the Finger very ren(ibly,whcrcfpevcr apply’d, wirh - 
a pufti 9r puff hke Wind. The Crackling is full as loud 
as that of Charcoal on Fire^ nay, live or lix Cracklihgs, 
or mere, according to the quicknels of placing the 
Finger, have been produc’d from one Tingle Fndfion, 
Light always fucceed ing each of ’em. Now I make no - 
qaeftioHjbut upon ufiuga longer and larger piece of Am- 
ber, both the Cracklings and Light would he much grea’-- 
ter, bccaufe I never yet found any Crackling from the - 
Head of my Cane, altho’ ’tis a prcity luge one 5 and it 
feems, in feme degree, to rcprcfcnt Tbuiukr and Light- 
ning 5 but what to me is more frrange than all I have-, 
been telling you is, thattho’ upon friefion with Wool in 
tlae day time, the Cracklings Teem to be full as many and 
