C ) 
II. An Account of an Experiment made before the 
. Royal Society at Grefliam College , together 
with a (Repetition of the fame, touching the Tro* 
etuBion of a Confider'able Light upon a fight Attn - 
tion of the Hands on a Glafs Globe Exhaujled of 
its Air : With other (Remarkable Occurrences. (By 
Mr Fra. Hauksbee, R R. S. 
TTAving had the Favour of making feveral Experi- 
J_'j_ ments, in Relation to the Produ&ion of Light 
from Sundry Bodies, and in Different Manners, before 
this Honourable Society, which they were pleas’d to 
Countenance, by their Approbation and Publication of 
them, as being in fome refped or other. Different from 
any heretofore made on the fame fubjed : Which, with 
the Hopes I had ftill of Advancing fome farther Difco- 
ries $ And that I thought my Endeavours of this kind 
would not be altogether unacceptable to the Society, 
Together with the Noblenefs of the Subject concurring, 
prompted me with all willingnefs to profecute the fame. 
The Experiments-already made on this head, As the 
Attrition of Amber on Woollen, Glafs on Glafs, and 
with feveral other Bodies in vacuo, which tho afforded 
but a weak Light, yet the Manner of making them teem’d 
to open a way to farther Improvements, which, during 
the late Interval of Meeting, I purfu’d with my utmotfc 
diligence. The Refult of the many Experiments made on 
this occafion are compriz’d in a very few, which (hall be 
repeated before this Honourable Society, as Opportunity 
lhall give leave. 
T4 B One 
