[ 8 ° ] 
from the Tube 5 or there is nothing appearing in 
them which may lead us to fufpeft they are not the 
very fame, tho' in a greater Quantity than what can 
come from the Part of the Tube you approach with 
the End of your Finger. 
If we conclude with fome of the foreign Philo- 
sophers, Boerhaave y Homberg , Lemery y s Grave/and, 
&c. that Fire is equally difFufed throughout the 
Univerfe by the Creator, pervading the Interftices of 
all Bodies, and that there is no Fire mechanically 
produc'd de novo , then, may we not conclude, that 
whereas, by Attrition oftheglafs Tube, there is pro- 
duced a very quick and ftrong Vibration of its Parts, 
which muft neceflarily affeft the Fire contain'd in the 
Vacuities, by Compreflion and Relaxation 5 fo that, 
as Boerhaave expreffes it, there muft be, in the Bodies 
thus agitated, and in the Fire contain’d in its Pores, 
an exceeding great Motion excited, and, together 
herewith, the furrounding Fire, from both thefe 
Caufes, muft be agitated, and fo much the more 
violently, the nearer it is $ May we not conclude, 
that its Force will be hereby fufficiently increafed to 
kindle the Spirit to which it is convey'd ? 
In this, as in the former Hypothefis, I would not 
exclude the elaftic Materia fubtilis from being fup- 
pofed the having an Inuflence on the Effluvia. 
Whichsoever of the two Hypothefes we embrace, you 
may perceive, that I incline to think, that the kin- 
dling Fire rather proceeds from the excited Tube, 
I am very fenfible I am in a great meafure groping 
in the dark ; but hope future Experiments will caft 
