[ 421 ] 
‘‘ even this body attractive, as that of the fun. 
‘ < had made the amber.” 
REMARK. 
If Mr. boyle, when the amber was heated, 
prefled it ever fo lightly againft his hand, in order 
to try its warmth, (though without the lead: fric- 
tion), he excited it ; and, without this , it was not 
eleCtrical, neither would it become Jo in cooling. If 
the amber was too hot , the heated air about it 
would conduct. Therefore he was obliged to find 
a convenient degree of heat. This aflertion may 
be proved in the following manner. 
experiment xii. 
Hold a piece of amber near the flame of a 
candle, till it becomes hot ; then apply it to a fuf- 
pended thread, and it will not attract it , neither 
will it become eleCtrical in cooling ; but prefs it 
ever fo lightly on your hand, in order to try its 
heat, though without the lead friCtion, and (if 
it be not too hot J it will be eleCtrical, and attraCt it 
violently., Heat it again at the candle, and its 
electricity fhall be taken quite away. Prefs it 
again gently on your finger, or hand, and the 
power will be redored. Apply it again to the 
candle, it is lod. And thus alternately. Other 
eleCtrics may probably aCt in the fame manner; 
as the flame of a candle , or. hot air t will conduCt 
away the electricity cf glafs, almoft indantane- 
oufly. 
e - iliV/ C iv U,-.* 0 ii*^ ^ '-•3* > < ( 
EXPERIMENT 
