316° Singular Pearly Excrefcenée. 
diftance of the one corner from the other, the duft will ar- 
range itfelf in fuch a manner as to be found in the two dia 
meters of the fquare, dividing it into four equal fquares. At 
other times, if the bow deviates a little, it forms a figure 
like a double C, when the two letters are joined back to 
back. Ifthe fquare be held by the two extremities of the 
diameter, oppofite to that againft which the bow is applied, 
the duft will form a kind of oval, one of the axes of which 
will bethe fame diameter. If the glafs be of a circular fi- 
eure and be held by the middle, the duft will arrange itfelfin 
fuch a manner as to form the fix radii of a regular hexagon. 
In our next number we ‘fhall prefent our readers with fome 
farther particulars on this interefting fubjec. 
XVI. Account of an extraordinary large Oriental Pearly Ex- 
crefcence, which was offered for Sale fome Years ago at 
Peterfburgh. Fron Neue Norditche Beytrage, by Profeffor 
Pautvas, Vol. I. 
‘Tins remarkable production, which was brought from 
Holland to Peterfburg in the year 1779 im order to be fold, 
is reprefented fig. 3,-Plate VIII.. The poffeffor of it at 
that time was Mr. Daniel Gildemcefter Janz, of Amfter- 
dam, into whofe hands it came by bequeft from one Mr. 
Sander, an agent of Deux-Ponts, and had been purchated. 
in India for 50,000 florins (4,500. fterling). It was offered 
for fale, under the name of the Sleeping Lion, at double the 
above jum. It weighed 578 carats, and was quite perfect in 
its fhape, as feen in the figure; fo that its name fecms to . 
have been given it not improperly. The other fide was 
fomewhat flatter, and beautifully marked with zig-zag 
itripes (guzllefchirt) : the colour und fplendour were alfo 
remarkably fine; fo that-this production feems entitled to a 
place in the firft clafs of pearly excrefeences; and ‘on ac- 
count of its fize delerves to be made known as a curiofity mm. 
natural 
