Royal Society. 301 
glals be well warmed, then pour in the mixture, and roll it from 
fide to fide. 
Note^ this will alfo do when cold, but it is befl when the glafs 
is heated and very dry. 
Note_ alfo, that if your ball be of yellow glals, then all will 
fhine like gold. 
I0 faint G4als ivith Marble Colours j hy Sir Robert Southwell; 
Phil. Tranf. N« 245. p. 9^4. 
I. /^ RIND well upon a flone fome Minium for red. 2. Ra- 
VJT dix CurcuntcCi or rather Ceruffa Citrlna for yellow. 
3. Smalt for blue. 4. Verdegreafe for green. 5. Ceruffa^ or 
chalk, for white 5 which being all feparately wrought in oil, take 
a brudi of hog's hair dipped in any of the faid colours, and it 
will, being rolled in your hand, fcatter the fame upon the glafs; 
then with your pencil work them together as you think fit 5 and 
laftly, fling a little mead amongft them, which covers all. 
Ihe Magic-lantern improved j hy the Same, Phil. TranH 
N° 245. p. 354. 
THERE are made every where of thefe lanterns to repre- 
fent and magnify figures upon a wall, but then it is on'y in 
the darkj wherefore, to give variety of colours, take oil oflpike, 
and therein mix the leveral colours, wherewith you would have 
your glafs to be ftained 5 paint them finely on, they prefently dry, 
and penetrate any glafs. 
^he Phofphorus metallorum 5 hy the Same. Phil. Tranf. 3S]° 245. 
p. 5(^5. 
TAKE JLapis Smaragdi mineralis, fuch as is found in the 
mines of Saxony^ and beat it into a very fine powder 5 if 
you ftrew this very thin on any metal, and in any figure, and fet 
the plate on hot coals, in a little time you will perceive a light 
to fhine in the dark, which will lafl: as long as you continue the 
hot coals j and ii you put out the fire, it may do again for once 
or twice 3 but then the virtue will fade. 
Mineral Waters at Eglingham in Northumberland^ hy 2)r> 
Cay. Phil. Tranf. N"^ 245. p. 3^5. 
THE Do<^or had a mineral water lent him from Egling- 
ham^ which he found turned almoft quite as black as if 
galls were put into it, tho' it had been brought at leait 50 miles 
by land-carriage 5 after he had llovvly evaporated in a glafs 
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