( 28o ) 
I fliould have fooner anfwered to your very ac- 
ceptable Letter , had not my defign to Difled: 
fome Eels more then once, and alfb to fend aCut there- 
of with this hindered me. 
In the mean time I remain 
Tours, &c. 
Se'z/eral Microfcopical Obfefvations and £x- 
permefits^ made by Mr. Stephen Gray. 
V, 
HAving not long fince attempted to make fome of 
thefe Microfcopes, which Mr.ButterfieldAtiQnbts 
and inftrudJls to make,in the Philofophicai Tranfaftions , 
N° 141, P. ioz6. of the manner then lately brought 
out of Holland by Mr. Hugem \ but for want of (iich 
^ Lamp, as the before named Perfon mentions, I pro- 
ceeded after a fomewhat different Method. 
Experiment, i . I took a fmall Particle of Glaft, about 
the bignefs I defigned my Globule, and laying it on the 
end of a Charcoal, I could, by the help of a blaft 
Pipe, with the Flame of a Candle, foon melt it into a 
Spherule, and by this means I could make them indif- 
ferently cleer, and the fmalleft very round, and I could 
make them much larger, then by the unafTifted heat of 
the^ Candle 5, but thefe latter were attended with an in- 
convenience, they were on that fide that refted on the 
Cjoal flated, and received a rough ImprefTion from it ; 
nor were they without thofe Improperties (for which, 
or rather) to Remedy which, the ingenious Perfon above- 
faid, fubftiftuted his fpirituous Lamp, for a Wax or Tat 
low-Candle, viz. fmali Specks or Opacous Particles 
lodged 
