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VI. Experiments of the Luminous Qualities of Ambery . 
Diamonds, and Gum Lac, hy- Dr, Wally, 
in a Letter to Vr, Sloahe, R-. ^'Secr. 
SIR, 
H aving' lately obferv’d feveral natural folid No&^l^ 
Iffcas, not hitherto by any,- as I knovr, taken no- * 
rice of, (I think I may be well allur’d fome of the ' 
fi0/»e»a never ■ were,) at your Requeft I give you • 
the larger account ot ’em : But, before I fpeak of my 
own Obfervations, give me leave to inform you a little 
concerning the lArtificial ^ which, you know, .. 
is a Subjed I’m pretty wcli-acquainted with, having made 
a great number ot Experiments about it, whereby I was ’ 
naturally led to the following Remarks. 
You may remember my telling you many Years a go -of 
my good Friend Mr. Pfl'y/es communicating to me, about ^ 
the Year 1680, his way of making the Plrfphorus with 
Urine, at the fame time’deliring me to ufe all ray Endea- ■ 
vours to Pnd out fome •' other Subject, from whence »c 
might be made in greater Quantity, and perhaps he 
might have made the like Requelf to many more s, - 
for, to ufe his own Words, he faid, he really pitty’d his'^ 
Chymiff, who was forc’d to evaporate fo ' prodigious a ' 
Quantity of Urine, to get a very little of the Pho fphori^s, '■ 
Soon after, in order to fee fome Experiments in Chymi» - 
(fry, I lodg'd fora fhorc time at his Chymifi’s Houfe, one - 
Mr Bilgar, then living in'ALry le^Bone Street near Ficca* ■ 
d'U/j, who indeed was equally, if not more importunate' 
with me than Mr. Boyle, to try if I cou’d find out- Ibme - 
