(7 o ) 
'’ VI. He who knows perfedly the Method of ma- 
: king Phofphons , can choofe whether he will fub- 
lime his Magma of Urine into P hofpkorus, or into 
Sulphur; for the Difference confifts only in the En- 
cheirefis. 
III. Obfervations of the appearances among the 
.Fix'd Stars , called Nebulous Stars. 
W. Derham, D. D. Canon of Windfor, 
F. 5. 
H AVING laft Autumn made fome good Ob- 
fervations, with my eight Foot Reflefting Tele- 
fcope, of the Appearances in the Heavens, called 
Nebulous Stars , I think it proper to acquaint this 
Illuftrious Society with them, to inftigate others to 
make farther Obfervations of them, becaufe I think 
there is much more in them worthy of the Inquiry 
of the Curious, than hath hitherto been imagined, 
and becaufe I fear I {hall not be able to purfue my 
Obfervations much farther, by reafon my Reflefter 
lofeth its Excellence and Power, by beginning to be 
tarnifhed. 
But if any one would have a good View of thefe 
Nebulofx, it is of abfolute Neceffity that he makes 
ufe of very good Glades, elfe all his Labour will be 
loft, as I found by Experience. 
Thefe Appearances in the Heavens, have born the 
Name of Nebulous Stars : But neither are they 
Stars , nor fuch Bodies as emit, or reflect Light, as 
the 
